My nearest range is in the neighbouring province and so thats where I have a membership. When I did my last renewal I did not send my proof of membership and it took quite a long time to get without getting my new one, so I called the CFO office and she approved the renewal on the phone. She never asked for my membership and just said not to take my restricted firearms out until I call in with proof. I never sent it to her that day because when I looked over the membership papers the seller did not sign it.
My home province is Alberta.
All this to say that in Alberta at least, it seems to be up to the agent if they require proof of membership.