Posted By:
jay behrensAs someone else pointed out, a lot of the high grade vintage stuff has been stashed away in long hobbiest collections. When they change hands, they tend to change hands among that group. I've seen hoardes of cards out there would boggle the mind and you'd say no way. But they do exist.
This is not to say that a lot of high grade cards are not doctored. In the late 80s, there was a paper restorer that was buying up large numbers of 33 Goudeys so that he could use the paper from those cards to rebuild other 33 Goudeys making it much harder to detect the work.
Jay