The robbery remained unsolved for nearly six years, until estranged group member Joseph O'Keefe testified only days before the statute of limitations would have expired.
Of the eleven people involved in the robbery, eight would receive life sentences after a trial, with two others dying before they could be convicted.
While the theft was originally intended to be a burglary, rather than an armed robbery, they could not find a way around the building's burglar alarm.
[14] They each wore a chauffeur cap, pea coat, rubber Halloween mask, and each had a .38 caliber revolver.
They spent about twenty minutes inside the vault, putting money into large canvas bags.
[17] Immediately following the robbery, Police Commissioner Thomas F. Sullivan sent a mobilization order for all precinct captains and detectives.
[20] The only physical evidence left at the crime scene was a cap and the tape and rope used to bind the employees.
Police heard through their informers that O'Keefe and Gusciora demanded money from Pino and MacGinnis in Boston to fight their convictions.
FBI agents tried to talk to O'Keefe and Gusciora in prison but the two professed ignorance of the Brink's robbery.
On January 12, 1956, just five days before the statute of limitations was to run out, the FBI arrested Baker, Costa, Geagan, Maffie, McGinnis, and Pino.
O'Keefe cooperated with writer Bob Considine on The Men Who Robbed Brink's, a 1961 "as told to" book about the robbery and its aftermath.