At a place I worked years ago, a manager pulled off what was basically an inside job robbery. He somehow managed to get hold of the store keys, the cash office keys and the safe keys, came in at about 5am, turned off the store alarm, went into the cash office and opened the safe, walking out with around £80k in cash that hadn’t been collected yet, plus another £17k in foreign currency. It was quite calculated – he’d previously watched a security guard type in her alarm code so he knew how to disarm it, took the spare store keys from the security lodge (which weren’t locked away), and even held an umbrella up to block his face from the CCTV cameras.
The first two staff who arrived that morning noticed lights on and immediately knew something was wrong, then found the safe wide open and the money gone. The wildest part was that he still came in for his shift later that day like nothing had happened. He was eventually suspended because it was pretty obvious from the CCTV it was him, and after that we never saw him again.
Edit: Shortened original post.