How to Replace Lost Canada Post Mailbox Keys

1. Go to your local Canada Post Office or contact Canada Post at 1-866-607-6301.
2. Request a change of lock and a set of replacement keys. 
3. Canada Post will replace the lock on your mailbox.
4. Bring the Delivery Notice Card that you receive to the Post Office indicated along with photo identification.

You can also have replacement keys cut at Canadian Tire so you always have a backup available.