Techs are so often mislaying important parts, I thought this might be amusing.
Several months ago I was working on my Pioneer LD-S2 LV player, trying to get the loading drawer to work smoothly. (Never did.) During the process, I needed a new battery for the remote, and (I remember distinctly!) dropping the battery cover amongst all the junk in the living room. This wasn't a critical loss, and I expected to find the cover when-and-if I ever cleaned up the living room.
Well... about an hour ago I was cleaning out the drawer where I store batteries, and... you can guess the rest.
I must have dropped the cover in the drawer when I was getting a battery, and only thought I'd dropped in the living room after I couldn't find it.
Duh...
Basic rule... If you can't find something where you think you lost it -- it's almost certainly somewhere else.
"We already know the answers -- we just haven't asked the right questions."
-- Edwin Land