Hey thanks for posting your concerns, it will help other new owners. i think you have done everything right for him. He sounds a bit shy, he's had quite a big thing happen in his life, so it's taken him time to get used to the move. Try not to disturb the nest he is in, and if possible put a fresh small bowel of water near the nest opening, he may well come out at night to take a sip.
I know this must be very frustrating for you, most new owners expect to have lively chipmunks running around the aviary, most do, but occasionally you will get a shy one. He's likely not to be like this all the time, but you may have to spend more time taming him but when he's ready.