I have come up with the most sure fired way of finding lost tools. Go out and buy a replacement tool and the old one will just jump out at you! Its a miracle I tell ya!
I just moved down here to Maineville Ohio, I need to put up some shelving. I couldn't find my stud finder for anything. I spent 2 days looking for it. I finally gave up and bought a new one, it actually warns you if there is AC in the area. I used it for one set of shelves, and while working down in the basement trying to put my table saw back together I saw it laying right out in plain site.........
Gotta love it when that happens.....
Bryan