As I said upthread, I would list all the ones I’ve seen as US releases. However, if another editor had listed them as joint US and Canadian releases, based on a “Distributed in Canada by XYZ” message on the back cover, I wouldn’t change it.
This gets into territory covered in a thread regarding digital releases - many of which are listed in MB with all the countries in which they are purchasable listed as “release countries”. I personally think this leads to absurdity, but in the absence of a clearer guideline on what constitutes a release country, I’m not going to mess with it.