I got this set fresh from Canada Post online so it's not a
PMD. :( There's a small dent in the specimen toonie.
What would this error be considered?

I want to return it to CP. Anybody have experience with CP returns? Is it a hassle? Do they allow straight exchanges or do you have to go through the hassle of returning and then making a new order? (Because my order had a free gift card and I don't want to part with it since I cant reorder it. :P)