FILES FOUND!
We found a folder named "lost+found". This folder was created a few weeks ago, not by anyone in our office. We still don't know how they got there. We ran disk utility and Disk Warrior and did not recover the files. However, we figured out one of the file names and searched for it and found it in this file "lost+found".
So, we think that the OS encountered a series of lost files which it placed in "lost+found". The original folder remained in place with an image of those files, but not the files. The files images were lost the minute the folder was renamed.
Anyway, we have the files back. Thanks for your interest.