The documentary, due to be released next month, will suggest one of the thieves was a God fearing post office worker.
It's claimed the Irishman then donated part of the £2.6 million haul that was stolen from a Royal Mail train in 1963.
His identity is not revealed in the film although it's thought he died in 1995.
His share was around £135,000 and most of it would have gone to Catholic Church charities in Ireland.
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