Yeah, it's a Canadian box but it displays very well and has everything inside. The tape on the one side came off so I can slide the bagged contents out. I've already made sure Heavy Metal has his mic.
Think that will work against me?
The 2 big things that will "work against you" are that it is a CDN box. Vintage collectors tend to be sticklers for US packaging, especially in a line where Hasbro made the effort to change stickers based on market (CDN vs. US). Also, the open box makes it not MISB technically. Yes everything is still sealed, but it is technically open. That will also work against you somewhat.
I think you need to keep your expectations in check. As much as you may want to think otherwise, you won't get as much as the one that is sealed and US packaging. You will still get hundreds for it, but I would hazard a guess that you are looking at,
at least, 10% less than the US one.
However, it is Ebay, and you never know what can happen. You might just get lucky and hit a time period where there are some deep pockets competing for your item.