If you're wondering how this is possible, one avenue is CGCs terrible quality control.
During the pandemic, CGC sent out countless books without having sealed their holders. My assumption was a mix of new staff and high demand led to mistakes. I've seen a few of these books in person.
Here's an example of an EoSV #2 CGC 9.8 I purchased from an online seller. The book inside is absolutely not a 9.8 yet it's correctly sealed in the inner-well. The outer holder isn't damage at all, it was simply never welded together.
The holographic sticker is part of the holder, not the label, so anyone can swap the 3 components (holder, inner well with book, label) or print their own label to make their own CGC graded book.