I heard this week that the supplies (dry-erase markers, paper, etc) that had been purchased by one department had been taken (by whom, who knows) before it had even been taken to the appropriate room. I mentioned this to a sweet, young thing who said she had never heard of such a thing.
If I leave treats (you know crackers and such that they give us to make us feel appreciated) in my mailbox - my co-workers feel free to take them.
This is along the lines of the students who feel that if something is in my room, they are free to help themselves.
Keep little that I value anywhere at school.