This is a common turtle in the pet trade. Is it indigenous to your state? I highly doubt it. If it was a healthy wild turtle, it would have buried itself for hibernation by now. Plus, box turtles typically never move more than a few acres in their whole entire lives. He is only at your house by human interference and cruelty.

And also a word of caution about turning him into any local SPCA, or Humane Society... if you do this, please check them out carefully first. You would be amazed at how many will put down healthy, adoptable reptiles as a matter of policy. The HSUS and others are very much against pet reptiles, and if you turn him in to a typical shelter, well... he may actually be better of wandering into the busy city streets, which are his only other option right now besides your yard!

Please, if you are afraid of him, let me help you locate a reptile rescue! This little guy needs help. I don't think he's going to get another chance if you're giving up on him so easily .