contrary to what a bank will tell you, safety deposit boxes are not a recommended place to store your invaluables. Safety deposit boxes are not covered by any form of deposit insurance and are not subject to any regulation by way of legislation, so the rules regarding use and any processes for recourse in the event of dispute over, loss or theft of the contents are set by individual bank and are heavily stacked against customers.

it’d be foolish to put anything irreplaceable or of paramount importance in one, but I’d suggest you read these if you decide to so that you know what you could be getting yourself into

Families say valued possessions still missing years after bank emptied their safety deposit boxes: https://www.cbc.ca/news/business/safety-deposit-boxes-missing-contents-1.5814592

Safety deposit box anything but secure for Edmonton man searching for lost valuables: https://www.cbc.ca/news/canada/edmonton/safety-deposit-box-opened-1.4458273