Not true. I am in Canada and I got a refurb back after sending it in for repair (system freezing a few minutes into any game). I sent a machine in that was built in 2006 and got a refurb back that was built in 2005.
Needless to say I do not have it any longer as I pointed out to Futureshop where I bought the extended warranty that they guaranteed I would get a new unit if the one I bought ever broke down. They fought me a bit on the issue but in the end I got a new unit (the Elite in fact where I paid the 30 dollars difference).
Odd, I had a rather lengthy discussion with a supervisor at tech support, he assured me that all Canadian returns were new units. Mine most definitely was a new unit.