Both theories could be right. Tell your GF to report it to her immediate boss immediately. This way her hands stay clean and shouldn't lose her job because of it.
Tell her to suggest changing the locks and limit the number of keys to two. One for the closing/opening employee, the second for the immediate boss.
You need to pull some covert ops and do some surveillance with a camera. When you've got the perp on camera, yell out 'Bingo! We've got a winner!' and haul.
If you have power locks there could be a problem with your computer or maybe the keyless entry. I have heard of this before. Good luck!
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.