I didn’t submit any documented proof as at the time of my appeal I couldn’t get any documented proof. So for my case, in my webform I only explained the situation verbally. And I recently got my COPR. So I guess CIC is already updated regarding the issue.So you can ask them again in English version, if police is nice to you. For my case, I did write an explanation letter and screenshot the website blocked when I tried to log in to get the certificate by my foreign ID number, then uploaded it on GCKey together with my background check certificate. However, my application is kept silent for a month, I don't know it works well or not by this way.
Did you get approval for that yet?