See that's the unknown.
Unlike a few blind apologists on the CBCS boards I am of the belief that both companies can make mistakes but I also believe it to be the same book. When I had an experience where CBCS missed something on a book that CGC found and that I saw on the comic, I shrugged it off and did not say anything because it was going back to a CGC holder anyway. I figured I would cash that chip in should I ever need to if it happened on another book. When I had an experience where CGC missed something on a different book and added a problem I knew did not exist, I raised the concern with them and it was sent in for regrading and they realized that they made a mistake and we all walked away happy. Both companies make mistakes.
The puzzling this is that the book was sold.
As I noted, CLink notes that the book sold in August of 2018 in its CBCS Holder.
I cannot track down the date yet but the book ALSO sold on CLink in its CGC holder, obviously after it was graded by CGC.
This means that whoever bought it in the CBCS holder and had it graded by CGC has since sold it. $9500 is nothing to sneeze at so I would love to know where the outrage is.