This is a very common phenomenon. Fate Magazine has dubbed suhc items "jottles."
I have a real problem with losing things, primarily because I tend to lay things down where I happen to be because I need the hand, and then forget about it, so books tend to wind up on top of the washing machine etc. Retracing my path through the house from the last time I remember having the item usually works. When it doesn't, I ask my husband, who walks straight to whatever I lost. (He hardly ever loses anything!) When *that* doesn't work, I stand in the middle of the room and say sternly: "Fairies, give it back!" And it generally reappears someplace I haven't been.
My most impressive incident is a library book which I was reading on the couch in the game room. I left it open, face up, on a cushion. When I came back, it was gone, though I remembered where I'd left it. It wasn't on the floor or under the couch. So I retraced my steps, because obviously my memory was faulty. Nowhere to be found, not even on top of the washing machine or the back of the commode. I *knew* I'd left it on the couch, so back I went to look under the cushion. Nothing. Another round of the house, going everywhere, including places I hadn't been. Back to the couch. Nothing. Look outside, on the picnic table, on the balcony, asked the fairies to give it back, and returned to the couch. Still no book. So - time to call in the big guns, fetched my husband. He walked up to the game room as I was explaining how often I'd looked, and -
There it was, open, face up, on the couch cushion.
Stupid fairies, wasting my time, thinking it's funny...