How safe are safety deposit boxes? They're not as protected as you may think

A Montreal-area woman believes carelessness and lack of security at her bank are to blame for the alleged theft of $20,000 in cash from her safety deposit box. 

Irina Broido said she and her father opened the box in 2009 to keep important documents, jewellery and money. She eventually became the principal user when her father became too ill to leave the house.

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I've never had one and don't know if any of this apply here in the States.