Are you certain it was intentional? When I have guest I make sure nothing of mine is in their defined AO. Just so there is no mistake with them walking of with something of mine they think is theirs At my old place they had a corner of my living room that I designated as the place to stow their gear.

Now, at my new place, they pretty much have the run of the basement. They have access to all of my tools so I pretty much need to just trust they won't take them.

I try to adopt the philosophy of an Eskimo that I saw interviewed for a documentary. Everyone dries their fish outside their home. The interviewer asked the man if he was concerned about the fish being stolen. The man's response "if they need it that badly then they are welcome to it" . A wise man but his advice would be sometimes difficult to live up to.

Or you could adopt the philosophy of he who steals my purse steals trash. Pretty much true in my case. I don't have all that much in my house that is worth awful much.