Not a black hole, but gremlins and ghost who think it is funny to move things around. Happens all the time. I will put something someplace and go back a little later and it will be gone. I'm still trying to find some stocking stuffers I put away a few years ago. Once even a perscription pill bottle ended up in a box on my closet shelf in the bedroom. It had to be the ghost who put it there. Cannot think why I would have been the one to do it. Funnier still, why did I even a couple days later think to look in that box for those pills?