Good on you for giving the little guy a better life! I have dozens & ended up building a pond for just that reason.
You don't have to be immediately overly concerned about the eating as they can go very long periods of time without feeding, including hybernating for months. If this turtle has not been kept warm it may just be in hibernation. It may take him up to a week to come out of this mode.
Without knowing how this animal has been kept it's hard to say what the issue is but these are very resiliant critters. The most important thing you could do is give the little guy a good basking spot out of the water so it can regulate it's body temp. When I have a young turtle hesitant to eat I always resort to live bloodworms (blackworms). Call around to tropical fish stores to find one who carries or will order you a portion of live bloodworms, drain the water & dump them in his water. They will stay alive wiggling, tempting your turtle until he has to try them.
This never fails!
Don't worry, you're doing great.
I'll keep an eye on this thread if you have any more questions.
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