Here it was simpler, Kodak Canada, Toronto 15 Ontario. (don't remember what the postal code was after that was implemented.) that held up even after the actual Lab was Moved to Brampton, Ontario. their was another lab in Vancouver.
Actually North Vancouver - on Keith Road.
One anecdote:
A huge proportion of the Kodak film processed in that lab came in the mail in those little yellow and red envelopes with the address for the North Vancouver lab. The envelopes themselves were merely a convenience - the proof that the Kodachrome was process paid was on the outside of the cassette and on the edge printing - but most people used them.
And Canada Post provided a very favourable postal rate.
What most people didn't realize was that the volumes were so high that in their sorting facilities Canada Post wouldn't bother reading the Kodak address on the envelopes, they would instead just put the envelopes in the big bin that would be emptied one or more times a day for delivery to the lab.
Every once in a while someone would get cute and try to mail illegal drugs in a film cannister inside a Kodak envelope addressed to another address. And Canada Post wouldn't do what was expected - the envelope would just end up with all the others in the Kodak lab bin.
Those envelopes and the cannisters inside were, along with every one else's film, opened by the pre-splice staff at the lab in
complete darkness. Consternation and disruption would occur when something other than film was encountered. The police would be called, and things would proceed as one might expect.
Some might wonder why the pre-splice staff opened envelopes and cannisters in the dark. The reason - it was not unknown for people who had problems with rewinding film to send in 35mm Kodachrome without its cassette - just wound up in a closed cannister.