Hi, sorry for re-opening this issue to provide feedback but your changeset is kinda huge... I believe this box (and the one up the street) were mistagged.

I'm not super experienced when it comes to tagging mailboxes, but I've done a few of these structures in other parts of town and the tags look more like this: https://www.openstreetmap.org/node/12228651447

In any case, I'm pretty sure these aren't postal relay boxes--they're actual mailboxes corresponding to the buildings on that street. I based my approach on what's documented in the wiki, which uses an image of this model of box as an example: https://wiki.openstreetmap.org/wiki/Canada/Tagging_guidelines#Community_mailboxes