I saw a couple stories about guys getting suspicious and leaving traps. One guy hid a wireless camera and another hid a wireless microphone. That won't work now but back then one of them caught the bank manager, a VP, and the FBI all jimmying open the box within the space of a week. The other guy had a similar experience. One other guy was less sophisticated and just took a shit in the box. The bank manager called him to complain... I just found this: https://sanfrancisco.cbslocal.com/2...ling-safe-deposit-boxes-and-losing-valuables/
I have had a safety deposit box with BofA for decades, never encountered a problem. They were sent a letter, they ignored it. A similar event happened to my brother when BofA closed 555 California Street branch, letter was sent a few months prior he simply forgot; his stuff was sent to an East Coast holding center. PS as far as I know in SF there is a waiting list...