Is there any way a file would self-delete?

I seem to have misplaced some show files, possibly an operator error while cleaning up file structure a while back. The files that have gone missing, I think should've been in 'z' prefixed archive folders which were empty. Aside from my making an error when moving them, is there any reason those particular folders might have been emptied? 

It's probably a bit late to go through logs (as it was ages ago I moved them) and thankfully I think most files are either on USB back up or our RPU...

ta jh

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