About a month or so ago I cut out some quilt pieces, added the applique in the middles and then decided that the background should be smaller. So I hunted for my rotary cutter and cutting mat, and hunted and hunted...till a couple of days ago I took down a big pile of fabric I'd been saving for another quilt...well, there, under that fabric was my cutting mat and rotary cutter. I've passed by that pile many times, even shoved it over a little to put down a glass of tea near it...
Keep on hunting, you'll find it somewhere where you know darn well you did not put it.