We have a wild-caught, former breeder U2 living with us. When we first got him, he was alsolutely silent. He didn't make a sound, barely moved, and didn't display at all. We thought maybe it was because he had been kept in a garage for years in a small cage, no toys, one dowel, you know how that story goes, but over time, he started to "come alive" and display, participate in group calls, and make little grunting sounds. The "happier" and more confident he becomes, the more sound he makes and the more he moves around, ironically, the more unhappy I think he will ultimately be in captivity. He knows his place in the wild, I can see it when I watch him. He knows he is out of place here, that he may be better off than he was before, but we have awakened in him that desire for the wild, I can totally see it. If your bird is wild-stolen and can be returned, I absolutely think you should do the right thing. There's no question in my mind. What's stopping you from doing it?