Just One Of Those Things: Otherwise known as disappearing object phenomenon.  Mary Rose Barrington classified this weird occurrence into two different categories:

Jottles:  This is the more common of the two where objects are displaced either via teleportation, poltergeist phenomena or an apport (a spirit moving an object).  
Oddjott:  Miscellaneous weird episodes that have no rational explanation
Jottles are then further broken down into subcategories:

Walkabout. This is the most common jottle, where an item disappears from a known location and is found later in another and often bizarre location, without any sort of explanation as to how it got there.
Comeback. An item disappears from a known location and anywhere from minutes to years, reappears in this very same location.
Flyaway. An item disappears from a known location and never reappears.
Turnup. An item which appears in a location which it couldn’t have been in before.
Windfall. An unknown item to you randomly appears.
Trade-in. An item that disappears and never comes back, but a similar item appears instead

I am currently gathering stories from people who have had an experience with JOTT: where items go missing and turn up in odd places and not where you left them or under odd circumstances etc. If you would like to share your story with me which will end up being published for a future article and possibly in a book.   It doesn't need to be a long chapter, a couple of lines is fine. It can be anonymous if you wish, or sign your name at the end.