Update. . .
My files are on an external HD.
They are in .WAV format.
I had iTunes set to manage the folder.
Apparently, because there are no tags for WAV files and since I had iTunes managing the folder, it moved the files into an Unknown Album / Unknown Artist folder. It did not delete them. Annoying, nevertheless.
My bad.
![Duh :duh:](https://www.audiocircle.com/Smileys/audiocircle/duh.gif)