I've had the same thing happen. We don't wear shoes in the house so I always have slippers on. I dropped a part and looked and looked for hours with no luck. When I went to change for bed I found it in my slipper.
If it is Lost in Space, ask Robby the Robot to find it. You must have a very understanding spouse. If I ever asked my wife to get on her hands and knees on the basement floor to look for ANYTHING, I would be reassembling my layout at my new home (over my daughter's garage because that will be where I would living until the day I die).
lol... I've lost... then found things several days later. The strangest ones I recall were... a spring that landing in my hair... which I found relatively quickly as I was about to look on the floor it fell out of my hair onto the table. Still not sure if it was the same spring... or if 'I' have a few springs loose. I was de-spruing a small part which I thought flew across the room... looked for quite some time and gave-up... found it in the shirt pocket I was wearing. Darn model railroad magic tricks!
I was taking photos of one of my Kato Mikados and it fell over while I was trying to position it. After setting it back upright I looked through the viewfinder and noticed both the whistle and the bell were missing. I spent hours looking on my workbench, all the floor within 20 feet of it and everywhere else I could think of to no avail. They are still missing, presumed lost. Darned n-scale detail parts are tiny little suckers!
I use a magnetic sweeper to find metal parts. Works like a charm. Cost about $12 @ the local big box hardware store.
Wasn't Robby the Robot in the Walter Pidgeon film 'Forbidden Planet'? I thought the Robot in 'Lost in Space' was just called 'Robot' I lost the large Antenna off the BMLA Tower last January - I only found it again when we were clearing the house for the move in August!
Its off my GP 38-2. I coulda swore I had some spare horns somewhere myself...no such luck. I am putting the sunshades on today...and still stop now and then...and look around for that horn...LOL. .
Well I have used the vac and a piece of white paper and tweezers to sort through all the stuff I found. Then after I come up empty I call the Wife. Now she ordinarily can't see the detail parts on the models but doggone if she doesn't find the part. If I am lucky one of the cats is in the room when the part flew. They have the eyes to spot a noseeum flying across the room 20 feet away. Of course getting to the big guy before he eats it is the challenge since I don't move so fast now. And then after an exhaustive search I have also found the part on the work bench about a foot away. Do the folks in the Horribly Oversized scale have this problem too?