No matter how you lock your stand, nothing will make it theft-proof. I swear, some guys would ferry a oxy/acetylene torch into the woods to steal someone else' s stuff. I have heard of people cutting a whole tree down with a chain saw just to grab the stand in it. WTF??? Some guy took one of my stands a couple years ago - cut the lock with bolt cutters - then left the pieces of the lock for me to find at the base of the tree. How nice.

Last year, opening day of rifle season, I concealed a pair of USED hunting boots in my ground blind behind a log (covered up too) when I left to get lunch. I came back an hour or two later and they too were gone.