Originally posted by PayItForward
Get him scanned. If he has a owner, contact them and have a chat to find out the situation. You would want a stranger to do this much, if they found one of your cats.

If he is a beloved and missed pet, he would need to be returned.

If he has no chip or the owner doesn't sound suitable, keep the cat.

Good Luck. It doesn't sound likely that you'll have any problems.
I agree a 100% - Good luck!