It's called respect for your fellow hunter. I hunt state land also and time to time, I will come upon a stand that someone has hung in a particular area where I want to hunt. Yeah, it's not HIS tree but I respect him for scouting and finding that area, and I move on. I don't vandalize his equipment. As far as getting a game warden involved, I don't think that you will get anywhere. YOU know HE did it BUT you didn't see him do it. Hell, I caught a tresspasser one time, filed a complaint thru the local police, took him to court and he walked because I didn't have a witness! The guy told the judge that he wasn't on our property and I was the one that was on the property where he COULD hunt and the judge took his word over mine, and I caught the guy red-handed! If I were you, I would just chalk it up to experiance and find another spot.