I took a look at the video you posted of this baby. I'm concerned that the guy is just letting it be outside like this, it's just not really that safe. And two, there seems to be not very much red on this baby... it does NOT looks like a red factor to me, or you would be seeing much more red on it. It has mostly green on the wings and yellow/green on the head to me, so you are most likely getting ripped off several hundred dollars for a baby with only around $300.
Ellen posted some excellent advice and info above as well.
That's exactly what I thought, that baby in the video is just a normal Sun Conure, it doesn't look at all like a red-factor to me either. I hate that people do these animal scams, and it's getting worse and worse with parrots every day. You can't look on any Craigslist pet page without seeing multiple parrot scam ads, and while it used to just be African Grays and Macaws, now it's all species of parrots. Asking $700 for a normal Sun Conure when you can buy a hand-raised, sweet baby from a very reputable breeder for $300-$400 is just awful...And honestly, there is no guarantee at all that this guy even has ANY bird for sale at all, that video of the baby could have come from anywhere, or he could have taken a video of someone else's bird, or his own bird!
This is exactly why you should NEVER "send" money to a breeder of any live animal BEFORE YOU VISIT AND SEE THE ANIMAL!
When I bought Kane (my Senegal that I got as a hand-raised, 12 week old baby), I first found his breeder on Craigslist after doing a search that went out hundreds and hundreds of miles, because I knew I wanted a Senegal Parrot, but I couldn't find a single hand-raised baby Senegal anywhere in Pennsylvania (except for those "Anna" and "Lilly" women who are located in Scranton and Hazleton, and who sell literally every species of parrot on earth for hundreds if not thousands more than the average price; they're quite literally parrot "Brokers" who buy hundreds of hand-raised baby birds from their actual breeders, and they buy them at extremely cheap, wholesale prices because they buy them unweaned, and then finish weaning them themselves and then sell them for hundreds if not thousands more than they paid for them...end of rant)...Anyway, I found Kane's breeder in Raleigh, North Carolina, a 9 hour drive away from me! However, i really like his breeders, they are a couple of high-school teachers in their late 50's-early 60's who have bred a few clutches of parrots a year for decades, and who own a Macaw, a CAG, and a Red-Bellied Parrot themselves, and are just lovely people. I contacted them as soon as I found their ad, when Kane and his brother were only around 8 weeks old. So I spent a good month or so talking to them almost every day, and having him send me a new photo almost every day of both baby Senegals, so that there was absolutely no doubt that he was raising these two babies. He sent me videos of both the babies and their parents, he sent me photos of the parent's dated paperwork and hatch-certificates, along with photos of the same for both babies. And they were happy to do all of this stuff for me for a full month before Kane was ready to be picked-up, because they knew I was willing to drive 9 hours one-way to come get him, because I really wanted a Senegal and was willing to travel as far as necessary to get the right baby for me. And though he typically asked for a deposit of half the cost of the bird to hold it, he didn't require this of me since I was willing to drive from State College to Raleigh. i didn't pay him a cent until I got to his house outside of Raleigh, he took my word and I took his because of the trust we had formed for each other. I probably got around 50 photos and videos of both Kane, his brother, and his parents before driving to NC to get him...And I also paid HALF or even less than half of what a hand-raised Senegal baby costs up in the Northeast US, because the further South you go, the more parrot breeders there are, and the more competative their prices have to be...LOL, "Anna's Parrots" in Scranton had one hand-raised Senegal baby for $800, and I paid $300 for Kane! So the drive to Ralieigh was well worth it, and I actually love NC anyway, and have a close friend from high-school who lives in Raliegh, so we made a weekend of it, and since Kane's breeder had harness-trained him from very young, I had bought one and brought it with me, and we spent the following Sunday walking around the Duke campus in Durham...
The point I'm trying to make (instead of boring the OP with my own stories) is that this breeder started his "relationship" with you, or rather his "contact" with you out with a blatant lie and a totally fake video of what was supposed to be a breeding-pair of Red-Factor Sun Conures that were the parents of this baby he had for sale...And you busted him on it! And this guy isn't very bright either, as not only did he not realize that you could just back-search the video's history to catch him in his lie, but also the video he sent to you wasn't even of a pair of red-factor parents, but rather only one parent that looked like a red-factor (at least to me it was only 1 that could have been a red-factore), and he didn't realize that this wasn't going to prove anything as far as the lineage of any babies that this pair would have...
So the point is that this guy also does not seem like a person who is familiar with breeding in-general, and definitely not familiar with red-factor Sun Conures or their lineage/genetics. So this is just another red-flag that indicates that this is a total scam.
Have you spoken to this guy yet about the video? The reason I ask is that a lot of the time when people catch someone scamming them and they've already sent them a deposit, the scammer then just vaporizes, their phone number no longer works (they typically use "burner" phones), their email is never answered again and is not registered to a real person, etc. They just disappear and move on to the next person. So you want to be very careful about how you approach this situation. i mean, I totally agree with Itzjbean, there is no way I would send this guy another cent...And even if that baby in the video is real and does exist, and is actually for sale, it is not a red-factor Sun Conure, it's just a Sun-Conure...so there's no way you can pay him $700 for that baby...So you need to handle this very carefully, because if this whole thing is a total scam and there is no baby, which is what I suspect, he'll just vanish the second he knows you're on to him...
Something else you need to think about too...Let's say that this baby Sun Conure does exist and is for sale, and let's say you're able to get him to sell the baby to you for $300-$400, which is the average price of a hand-raised, baby NORMAL Sun Conure...How do you know that the baby is even hand-raised without interacting with it? This guy is lying about the baby being a red-factor, so he may very well be lying about hand-raising the baby, and it may very well have been parent-raised. So this is another reason to not send him another cent, and only give him more money after you get to his place and see the baby, interact with baby, and ensure that the baby is a hand-raised, tame, friendly baby Sun Conure...
Honestly though, I'd try to get my $200 and say goodbye. There are sooooo many great private breeders of Sun Conures out there, they are literally everywhere, and you can easily find many reputable, experienced, and honest breeders within driving-distance of you who are selling hand-raised, tame, friendly normal Sun Conures for around $300...You're much better off to get your deposit back, say thank you, I changed my mind, and find another breeder (if you're wanting a normal Sun conure). I bet you can find a normal Sun Conure that is hand-raised and is fully abundance-weaned and ready to go now, you won't even have to wait, and the price will still be right around $300 or so. That's how many normal Sun Conure babies there are out there for sale from breeders. Please do not feel trapped, like you HAVE to buy that baby from this guy. At best he lied to you and tried to con you out of hundreds of dollars, and at worst the whole thing is a scam and there is no baby at all, normal or otherwise.
And if you truly ONLY want a Red-Factor Sun Conure, then get your money back and start-over looking for one. I've seen plenty of hand-raised baby, Red-Factor Sun Conures for sale in my searches for birds from breeders, and I wasn't ever even looking for a Sun Conure. So they aren't that rare, they're definitely out there. You might have to wait a while for one, you might not, but either way this baby isn't a Red-Factor. So if that's really, really what you want, then don't just "settle" for a normal Sun Conure, not from this guy or any other breeder, because trust me, you'll only regret it forever...