You need to call the company that manufactures the copper cookware you purchased and ask them specifically if they are safe for use around birds, and specifically if they have any type of coating on them that contain PTFE's, PFOA's, etc.
If you use the really expensive pots that are made entirely of copper and have no non-stick coatings on them, then that to the best of my knowledge is fine for birds. However, it's the copper pots and pans that are not made entirely of copper and/or have some type of non-stick coating that have been found to be toxic.
If you call the manufacturer and they aren't sure, then you absolutely cannot use them!!! The problem in this situation is that birds have died from people cooking in their kitchens with pots and pans while the birds were in a separate room on the entire other end or different floor of the house with the door shut and the windows open!!! The fumes become so toxic after the pots/pans hit a certain temperature that the toxic fumes that are released seep everywhere in the house, and it only takes one breath of the fumes to kill your bird almost instantly, and even if you are sitting next to your bird when the first sign of something being wrong happens and you rush them to the animal hospital that minute, it's already too late. So it's not a situation where you can just use the pots and pans and hope for the best.
If I were you I would put the set of pots and pans up for sale on eBay, your local Craigslist, etc. and advertise them as being "like-new" condition and only used a few times, just purchased brand new, and the only reason you're selling them is because you can't safely use them around your birds and you weren't aware of this when you bought them. You should be able to get most of your money back, and then you need to purchase a set of ceramic non-stick pots and pans. I bought a very expensive set of ceramic non-stick pots and pans at either TJ Maxx or Ross (I don't remember which but they both sell good stuff), and they cost a fraction of the retail MSRP. Most all of the big brand names now sell ceramic non-stick pans that contain none of the toxins, as they have to in order to compete. Greenpan, Greenlife, Caphelon, Phillip Richard, Rachel Ray, etc., they all sell multiple non-stick options that are safe....
It's just not worth risking the life of your bird/birds for a few hundred dollars...