I lived in Boston in 1990. A friend of a friend worked as a security guard at the Gardner and took the night off that night (either to party or perform in his b

I lived in Boston in 1990. A friend of a friend worked as a security guard at the Gardner and took the night off that night (either to party or perform in his band) and someone else took his place. My friend said the FBI was "up his ass" as a result to determine if he was part of the caper. Regardless, everyone thought it was something related to the New England mob, which was still powerful at the time. But nobody squealed with verifiable information, which seems strange considering the feds and state police were actively targeting the mafia (thanks to help from Whitey Bulger and his pals in the FBI) and knowledge of the heist would have been an opportunity to lessen law enforcement pressure and/or reduced sentences during subsequent prosecutions.