I think that I would speak to him or even try to catch him in it ,then confront him ,I believe if you tear his stand down your opening yourself up to trouble ,he might come in and scare the deer off or even destroy your stand's .I wouldn't like it if I went out early one morning to go to my stand just to find it destroyed{your stands}. I'd leave it first, speak with the person that you think might have put it there,without making accusation's . Keep a close eye on the stand and hope you see someone using it and confront them.If this doesn't work then I'd contact the Ministry.

nubo