There was one time I picked up books from CGC’s facility, maybe 8 years ago. This was when you could sit in one of the rooms and go through your books as customer service checked books you are dropping off.
I had submitted a few copies of Incredible Hulk 197. I looked all the books over noticed one looked under graded and one looked over graded. The CS rep asked what was wrong and I explained it to her. She went be I get a grader for me.
Paul Litch came out to take a peek at them and said he would be right back. After 15 minutes or so he had one book with a bump (where it should have been) and the second book had its grade dropped by .4, again, where it should have been.
There was no way I could have sold the over graded book as it was. The book that got the bump is still in my personal collection.