It may well be wild especially if it's been raining a lot. Last year I found some hatchling snappers near a bone dry drainage ditch with no ponds, lakes or rivers anywhere even remotely nearby. I'm guessing the mom laid the eggs after spring rain or melted snow filled the area with water. So if it's been wet down by you it may have just ventured out too far and everything dried up.

That being said, if it is someone's pet I hope they come claim him. Best of luck with him if no other shelters will take him in.