Thanks! We sent our application to Mississauga last week and it was received today, according to the online tracking from Korea Post EMS service! See below for how this could be good or could be not-so-good.
Korea Post does have an international courier method called EMS which you can track online to an international destination. We sent it that way because we had friends who also sent it that way with no problems. However, I'm personally regretting it a little because we don't have door to door confirmation. What we do have is a confirmation all the way to the "delivery office" in the Post Office of "L4Y" today at 5:55am. L4Y is the next postal district over from the CPC, according to Google Maps.
My intuition tells me that this is where it was loaded onto the truck to be delivered with all of the other applications they received since Friday, especially since it's doubtful that the CPC office is open at 6am. But, we don't have that peace-of-mind you'll get with an international courier of repute, like FedEx or UPS. It's up to you if that 70 000-100 000won extra is worth it for your peace-of-mind (EMS was 44 000won for a 1.5 kg box). What I didn't do was write the courier address on it, but rather the regular address. Given a second chance, I would have certainly written that courier address, but hindsight's a trip, eh?