I'm curious if you received the same emails I did. We got ours from our cert vendor, so I suppose that's as about as direct as it can get. If your domain registar was crafting their own, then I could see how you might have gotten blindsided. There's always a risk of information loss when the game of telephone comes into play.

When I first started looking at this myself, I was surprised at just how many TLS cert brands Symantec held: damn near half of them.