Re: Call me old fashioned if you will but...
Years ago an employee was let go in the middle of the week. This was a very competent, well liked individual and his dismissal came as a shock to me and my co-workers. In the coming weeks users reported to a series of missing files. I was able to restore them and I didn't think too much further at the time.
The next time I ran into the person I mentioned the files.
He was a little embarrassed to tell me had deleted those files while collecting his belongings from his desk. I've never forgotten since that even normally reasonable people can do very strange things when they are upset.