If you don't have a warranty they make you send it in yourself. If you are under warranty they will send you a prepaid coffin. The last time I sent my system in I sent it myself via UPS rather than waiting for the coffin to come to me and it saved about a week compared to waiting on the prepaid box the first time. I just used some old styrafoam packaging and peanuts and stuff along with the static bag it came in. They just gonna swap your system out for a refurbished one anyway so don't worry bout it.
I know in the states you can either send it however you want. Maybe you should call them back and ask what is the best way coming from Canada?