Martin Evans appeared for Jacqueline Swan who, together with Milton Woolf, admitted money laundering charges.
Armed police raided centres in Hampstead, Edgware and Park Lane believing some of the safety deposit boxes were being used by criminals. £500m of assets were seized leading to a series of separate asset seizure applications and criminal charges.
Woolf, the owner and director of Safe Deposit Centres Ltd, pleaded guilty to 14 charges in January, including possession of a firearm and false identity documents and allowing money laundering.
Jacqueline Swan, who was employed by Woolf, was sentenced to a year in prison. She pleaded guilty to seven counts of failing to disclose acts of money laundering.
Det Supt Mark Ponting, from the Met's Economic and Specialist Crime Command, said: "Already around £13m has been returned to public coffers."The disruption this operation has caused to organised criminal networks has been significant."