I lost my first knife back in December. Kizer Ki405, superb knife. I was absolutely heartbroken, not only to lose a $100 knife, but for me to actually lose a knife is just bad. I spent months wracking my brain trying to figure out where it was, because I remembered the last day I had it. I finally settled that it had to be in my friend's old car which he subsequently sold a few weeks later. Lo and behold, I find a hoodie a few days ago I haven't worn since that day, and that knife, some gum, and some mints are in the pocket.
Moral of the story is sometimes lost knives turn back up. Also don't keep a knife in your jacket pocket.