From what I've been told by some of my Canadian friends most publishers get around the law by putting a crappy French language "wrapper" over the US version of the game box (but under the shrink wrap)... which most Canadian buyers throw straight in the trash
Of course there are some games that actually get a completely different cover in Canada for this reason, the most notorious example I can think of is this:
I'd love to get in touch with some Candian CE collectors to see if any of the CEs received alternative french box art.