Before I issued the "mv *../" I had erroneously issued "mv *../*" which effectively moved everything in my current directory and everything in the parent directory into the last file in the parent directory.
Ahh, the consequences of incorrect syntax.
I don't want this to reflect poorly on Thecus, so I'm making my mistake known. The good news is that I still have the original copies, and my trust in my NAS is renewed.