you could be charged with larceny. even though he was trespassing, if you take his property and willfully refuse to return it he can charge you for larceny. is your property posted for no trespassing? if not, he technically is not trespassing, he has to be told not to be on the property. if he is told and remains,then he is trespassing, if he is told to leave and not to return, then he returns he is trespassing. check with your states laws on that it may be different from state to state. what i would do is (if your land is posted) say yeah i'll give your stand back, then go charge him with trespassing. first make him prove it was his, kinda hard without serial numbers, or any identifing marks. if you found it on your property, finders keepers. if its been "abandoned" on your property he must not have wanted it. charge him for damage to property for damaging your tree, then id do the trespassing, and if you really wanted to be a p.i.t.a. charge him for illegal dumping(littering) for leaving his property on yours. lots of ways to deal with this. tell him to call the game warden, the talk to him to get it best resolved. but be sure to go out and post your property in the mean time if you have not already.
"There is always time to think about what you want to do,
Until it comes time to start doing what you were meant to do."
Be more concerned with your character than your reputation. Your character is what you really are, while your reputation is merely what others think you are.~unknown~
"The true test of a mans character is how he treats someone, from whom he has nothing to gain"
"It's the things that people don't know about themselves on the inside, that make them afraid"