Several weeks ago, I misplaced my keys (car/house/office) somewhere at home and had no idea where they were. They weren't on the table by the door where I usually put them when I come home, or on the shelf on the other side of the door where I sometimes put them. Or on the messy table by the couch, or in a pocket of my pants, or anywhere else I thought to look.
I had extra house and car keys (even though the extra set was only for the top lock of the door, not the bottom), but I had to go to an office on campus to get duplicates for the office keys. About and week and a half later, I went to the office as usual, came home, and was about to unlock the door when I realized I had a key for the bottom lock as well as the top. Sometime during the course of the day, I'd "found" my previously lost keys....and "lost" my new keys!!!
I looked for the new keys everywhere and couldn't find them! I tried to figure out where I had put the original keys and picked them up. It seemed like it had to have been at the office, but it couldn't have been. A couple of days later, when I was cleaning the cat pans in the basement, I looked up at a wall shelf near the bags I use for getting rid of the unmentionable stuff, and saw my "new" keys!
Evidently, the day I "lost" my original keys, I had gone down to the basement to clean the pans or take some litter down or something, and left the keys there. And on the day I "lost" the duplicates and "found" the originals, I did the same thing, but I picked up the original keys when I left.
Well, at least I know it's just inattention (it's happened all my life--I often forget where I parked the car in the parking lot because I'm just not paying attention to it) and not alzheimers (which would not just cause me to forget where the keys are, but to forget what keys are or that I had any in the first place).