As an IT manager, I needed to keep a few tools around my office. I got so tired of people running in and hollering, "I need to borrow your screwdriver for a second.", as they grabbed it and ran out the door - never to be seen again. Or if I wasn't in the office, when I got back the screwdriver would be gone. So I put it in the desk drawer - still gone. Hide it behind the books on the bookshelf - still gone. I finally went to Wally-World and got 2 dozen screwdrivers. Hid them in each desk drawer, left one on top of desk, on bookshelf in front of books, on window sill, under stuff in drawers, in supplies boxes, etc. After about 15 of them disappeared, it seemed to reach some sort of threshold where everyone who needed one, had one and the disappearance rate slowed way down. After a couple of years, I still had a couple of them around and I could just leave them lay on the desk and nobody bothered them.