the panic button. they were probably waiting to see if the cops were going to show up. >> according to the fbi, nearly nine of every ten museum heists have an inside component. rick abath, the guard who left the thieves in was interrogated for days. he also took lie detector tests. he was never charged with anything. and when we talked with him, he maintained he had nothing to do with the heist. and what about the regular night watchman who called in sick that night? rick remembers after he buzzed the thieves into the museum, they asked him if he was alone. >> i wonder if that -- are you here alone? there were provisions for a single guard to be here. i wonder if are you here alone meant did they get anybody to come in? but i don't know. >> but that night watchman, the one who called in sick, was never charged, either. in fact, no museum employee has ever been charged with anything