Posted By:
davidcyclebackDuly note that I said "in part" based on the word of the person who submitted the card.
A woman had a rare card that one of the grading companies wouldn't grade because they hadn't either heard of the card or was unsure of its legitimacy as an issue. Though the cards weren't in the Standard Catalog, the issue was known and one of cards was auctioned by a big auction house. I forewarded her a scan of the auction page from that auction. This was used as evidence of the card's legitimacy for the grading card company.
On the other hand, if the President of the auction house submitted it, saying what it was and that they had auctioned that issue before, the grading card would likely would not have required other evidence that it was a legitimate trading card.
This was a few years ago, and I know that a bunch of the cards were offered by a different big auction house and likely the cards are now listed in the Standard Catalog.