Should have come back MS62 or MS63 depending on a few factors that can't be deduced from those pictures. Definitely shouldn't be more than MS63 based on the amount of chatter in the fields. Based on severity I'd guess it's more likely it came back MS62. By severity I mean how deep the hits are. We know there are a lot of them - you can have that many in a 63, but they can't be deep. Those look deep to me.
Hard to judge the lustre and toning from the pictures but those could be a factor in the grade as well.
I wouldn't be surprised at MS63, lighting and angle is so important on these, you could probably make it look EF or MS65 by playing around with it. A pretty standard grade for that coin, I don't now if I would purchase it at current gold prices. There are lots around and would not be surprised if gold came back down in the not too distant future.
They were submitted in the original BoC sealed capsules to get that designation. You can cross-grade from NGC to PCGS and get the same designation as long as NGC noted it as bank of Canada hoard on the holder. I know because I've done it. Lol.
And that is an incredibly generous grade. Maybe it looks way better in person. Superior lustre and nice toning will sometimes carry it up into a higher grade but that seems like a really tough looking 64 to me. I have a 1914 $10 64+ that I feel the grade is a bit of a stretch as well.
Nice result for you for sure. My 1913 $10 MS64 definitely looks nicer than that!