RE: If you found a stand on your own land?
You can do one of two things.Pull their stand and leave a note,Telling them where it can be picked up,If and when they do,get their plate number.And decide what you want to do about the tress.
Or Stake out the stand and catch them on film(for prosecution)and confront them as to why they are hunting your property without prior permission first.
It's not how big the Deer,But the size of the experiance that matters!!