Haha, they can't open your mail though, AFAIK. I mean I'm sure theres a few scenarios where they can, but they can't just be like,your suspicious I'm going to open your mail. It's not the Canada Post post office workers job anyways.
And they cannot ask you whats in your package. Or rather, you don't have to tell them.
I have a Pak-Mail near my house so they can ship by any courier type I want, but I hate it cuz when they're estimating value she always asks, whats in the box. And I have to tell her every time, thats not your business stop asking.
I love freedom and consequently America