The two most significant mail robberies both occurred in the early 1960s . In the UK , £ 2.6 million was taken in the ' Great Train Robbery ' of 1963 . A year earlier , $ 1.5 million was stolen from the hold-up of a U.S. Mail truck in Massachusetts . By the end of the 1960s , however , mail robbery had become less common
Great Train Robbery
Great Train Robbery (1963)
Mail robbery