[PSA] don’t use mailbox for tracked items

TLDR - use post office only.

Ijust found out that if you put a tracked item (that needs to be scanned) in a mailbox, it can take an undetermined amount of time to arrive. This is because it needs to first go to a sorting area to be scanned, and this (according to the employee at Canada Post I just spoke to) can take any amount of time!