LOL Cheeks, the exact same thing happened to me! I didn't sign up with my SIN number on the LSAC, because I'm a little paranoid about giving out that info over the internet (and rightly so). Imagine my suprise on Thursday when I got that letter... I was freaked! I figured that since the LSAC was so busy right now, that there was no way my score wouldn't be delayed. But I faxed my letter in on Friday morning, and had my score by Saturday evening... Silly LSAC.
Silly Canadians and their SIN. It's obvious we have to conquer them.