Treestands on state land question?

I was talking to a few guys I went to school with and they were telling me that they asked a DNR officer about hang on treestands on state land. According to the rule book, they are supposed to be removed 1 day after the last day of hunting, and supposedly the Officer told them that if stands were left up after that they were considered abandoned and free for the taking. That seemed odd to me, I would think that would be stealing, but I wondered is that actually the law? Other wise if someone left there stand there forever when would it be okay to remove it? Just wondering?