Hey Guys,
I don't want to scare anyone but just an advice:
My passports were lost by Canada Post not once but twice.
On first occasion, I didn't request signature upon receipt and the mailman dropped my mail to someone else's mailbox. The Canada Post helpline is not helpful at all. I had to track the mailman and work with him in order to get my passports back.
On second time, I requested signature upon receipt and still Canada Post managed to goof up my delivery. My mail was out for delivery for two days and the third day it said delivered and there was nothing in my mailbox, having been through similar situation before I tracked the mailman and he had no idea where my mail was this time. Turns out my mail was delivered to someone in completely different city. Thankfully, that person contacted me about the wrong delivery and then I got my passports back.
There is an option to request pick up. Always, try to pick-up your documents of high importance like passports.