I would keep it and leave a note as to where they could come explain themselves. Question? Your post says your property is correctly posted, does this mean tresspass laws in your state allow hunting if land is not posted? In SD you can't hunt private land without permission, posted or not. If that is the case i would be calling a state rep. about some law changes. IMHO, you should not have to post land to keep people off of it. A forgone conclusion that you ask first. Maybe I live in a dream world?