There should be a key on the front blue envelope. Even if that actual key was removed, there is a piece of sticker border around the actual COA. That portion will literally tell you that itself isn't a COA . So if you see that portion saying that, then someone stole it.
Here is a picture of a COA removed.https://imgur.com/a/UBqHo
Thank you so much for that picture!
I do have the peel off sticker and when I studied it again
I noticed a possible letter of a key at the edge of a silver square.
It was a "scratch off". I've never seen that before ever. Wow.
All my previous keys were always right there, bold and plain
inside the package.