I decided many years ago that there is either a 'hole' in the world that things fall down, or there is an invisible thief. I have lost one of a pair of cuff links, numerous books that cover special or interesting topics, more pens than I can count, photographs and other odds and ends that have never reappeared.
What annoys me is that I 'lose' things but never 'find' things. I wouldn't mind if lost things eventally turned up again, or if I found someone else's lost goodies. It frightens me that one day all this 'lost' stuff might turn up when least expected and I'll be overwhelmed with a deluge of paraphernalia falling out of nowhere.