This has also been my thoughts regardin the issue as well. After the long weekend they are fair game in my eyes as long as there isn't sign of hunters being there recently. I love the idea of name and phone number... I do this as well.. wished more would ti be on the safe sid and not step on others toes!I do like Pond Jumper said.
I personally put my phone number and name on my blind. That way, anyone can call me anytime if they are wondering if they can use it.