Do you think that the boss where I work is in on this?

I recently discovered that a man in the office where I work has been going into my desk drawers whenever I am in the file room and can't see him. I have been leaving the key underneath different things on the desk and he will look through everything to get it and then open the drawer that contains my handbag. He will leave the key in the lock with the drawer unlocked and my handbag vulnerable to anyone who walks in from the outside, as the public will come in from time to time. He uses the excuse that he is looking for a business card when he already has some of them at his own desk. When I confronted him about this, he did not seem nervous or sorry. The boss overheard it and came out and seemed to take his side. He said that where I sit is a community area and people have to look for things. I told him my bag was in there and he told me to keep it locked up, which is what I've been doing. That same day, the boss took this man out to lunch with him. It crossed my mind that the boss himself might be putting this guy up to this in an effort to find something, dig up some dirt, etc. What do you think of this???