If you've seen this, you should take pics and send them to CGC, maybe with an explanation of how it was done. I imagine they are always looking for ways to improve their casing. That would help everyone in this hobby.
I really wish I could, but I don't have pics, and the holder was eventually discarded.
PS - This is a golden opportunity to take a closer look at this. If "EnriqueG" is as innocent as he states (and I find this difficult to understand/believe), then when he receives the book back from his friend, I'm sure he wouldn't mind taking a series of close-up photos of the holder, the corner posts, the label, etc. and posting them here for the benefit of all.