[candiddevmike]

You'll never get an answer to this because answer == admission.

If you want a guess, it probably was related to pruning old accounts/old files.

[a_band]

Yeah, the timing is suspicious. Wonder if someone just fat-fingered a command.

[candiddevmike]

I wonder if there is any correlation to the files deleted and the user accounts that were pruned--basically the file was deleted because you shared it with a user account that was pruned