Hi Blue Chip,
Are these post_office=post_partner locations Canada Post locations? It's unclear to me what post network they are associated with or how they are different from amenity=post_office in Canada.

It might be helpful if you could offer your thoughts into the ongoing forum thread about Canada Post office operators since these seems like an alternative tagging scheme: https://community.openstreetmap.org/t/canada-post-outlets-not-operated-by-canada-post/129748

Thanks,
joel56dt