In the time that I worked at Canada Post, I experienced a great many things over 40 years, as you can well imagine. I've been retired for two years. The big thing I want to tell you about is the culture of Canada Post, the way that it treats its employees, and the way it deals with the union. I've seen various leadership there come and go, both on the union side and on the Canada Post side.
I would encourage you not to lose the opportunity to interact with those individuals who work at Canada Post. They are really dedicated employees. They're trying to do their jobs well, but constantly there are changes made that interfere with that, and they do not feel supported. You can send someone for a training session on how they should provide good customer service at the counter—and I worked at the retail counter, I worked inside, and I worked with the letter carriers—but when the management above you is treating you poorly, that training doesn't translate well out to the public.
I would encourage you to change the culture there, take the opportunity to make this a wonderful connection with Canadians across the country, and invest in Canada Post.