Check out this article:
https://abc7news.com/archive/8973198/
A woman opened her safe deposit box to find that the bank had opened it, removed her stuff, and rented it to someone else. That shouldn't have been possible, since they shouldn't have been able to open it without her key. But it was obviously not drilled into and replaced, since her key still worked in the lock. The bank had obviously lied about her having the only copy of her key. Also, she wasn't behind on her payments, and the bank never returned the box contents to her.