I lost ,of all things, my passport. I had used it for filling in some forms, and was sure I put it back in it,s secure place. A week later when I was getting ready to travel, I could not find it. It was a case of an emergency dash to the passport office for a very expensive replacement ( I had only changed it 6 months before). A week after I arrived home, I was turning the cushions on the sofa, and you have guessed it, there was my lost passport underneath a cushion. Have no idea how it got there.