I haven't seen Cuzco play with his toys too much. The one that he will go after is the plastic ball with a jingle bell in it. I put it on the ground and shake it around and he chases after it, attacking it and growling at it. Super cute. It's hard to tell whether he really LIKES the toy or really HATES it. But he will chase after it on his own.
He also has one of those pinata like toys in the corner of his cage (
something like this). There's a woven grass mat in that corner just below the pinata. I attached the grass mat so it's a horizontal platform and he really likes to sit on it. When he's tired he snuggles up to the pinata and kind of tucks his head next to it. I've seen him nibble and preen on it a bit too. He has one of those kabobs with the soft wood but doesn't seem to have figured it out yet. I've also seen him bat at his foraging cup a tiny bit but he doesn't seem to have figured that one out either!
He's also nibbled a bit on another woven thing in his cage.
What pellets are you feeding Pippin? I got the Zupreem natural stuff because I was in a hurry, but I wasn't sure he would eat them. He didn't hesitate. He'll hop from bowl to bowl, eating mash and pellets and whatever he can get. Maybe try adding a few pellets to the mash? I've also heard soaking a few in some fruit juice can help convince them to try it, though you'll want to find something without added sugar.
Ahhh, I'm jealous at how quiet Pippin sounds! What a little sweetie! Cuzco puts up a few moments of squawky fussing every night when we cover him or turn out the light. It does seem like he's getting a little better. We just ignore him and in a few minutes he shuts up for good. It's like a kid going "I'm not tired yet, I don't want to go to bed... I'm not TIRED!!!!....zzzzz"
Still working on getting Cuzco to enjoy attention. He's GREAT and will let you pet him lots when he's on your shoulder, but I don't want him to only be happy on shoulders.
He also bites insanely hard if you accidentally get your fingers in the way when he's killing his jingle ball or when you do something he doesn't like (like putting the flight suit on... hope I can get him to tolerate that better.... :C)