Are they stored in the CGC case?

I'd always assumed that many if not most Pedigree sets actually had physical certificates of authenticity, otherwise how would CGC verify them. I also noticed that a lot of my Pedigree comics in CGC cases appeared to have some kind of paper slipped inside, just barely peeking out and I assumed this might well be the certificate. The other day I received issue number 2 of Western Comics and it came with a certificate of authenticity as a pedigree comic from the Davis Crippen collection.

My question is, does CGC generally put the certificate of authenticity inside in comic within the case? Is it rare to receive the certificate external of the case (this is a first for me)?

Thank You

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