Police believe an operation of this complexity could only have been carried out by a limited number of criminal gangs - the "top level of organised crime".
A list of likely suspects has being drawn up, and officers hope other criminals may be able to offer information in return for favourable treatment.
As the net closes, one of the gang members, or a relative, may consider coming forward in return for a hugely discounted sentence.
But that could mean jeopardising a multi-million-pound pay-off and then spending decades looking over your shoulder.
Police are exploring the possibility that current or former members of Securitas staff gave security information to the men responsible.
Experts say no professional gang would risk entering premises to pull of a heist of this gravity without detailed knowledge of the building and the alarm systems.
Employees among a total of 60 are being interviewed by police and checks are being made on their backgrounds, relatives and friends for anything that may link them to suspects.
One of the men behind the £26m gold bullion theft at the Brinks Mat warehouse in Heathrow Airport was caught because his sister lived with one of the security guards
That's some serious Layer Cake drama... nice! 50m pounds ~ $87m, not too shabby.
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