Rejoice with me!
The lost has been found. A document that disappeared -- that I desperately needed -- that all efforts to locate have failed to turn up -- dropped on me, literally, this morning.
In fact, I've stared at this document throughout my ransacking. It was face down, with other scribbles on the back. It never occurred to me to turn it over. But when I knocked it off my computer tower and had to pick it up, there it was.
I knew it had to be somewhere!