They really have no way to tell. Assuming only one person is responsible and doing this is a misnomer. Also, who's to say they were only using ebay or that they were not doing deals before they started on ebay. Also, who's to say they were not submitting books via several authorized CGC dealers. If I am CGC I suspect every re-holder since this case was released. Though, you ask "recorded" but in order to find that out they are going to have to start cracking books. A lot of books. Books which are not in their possession.