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Mattkirk - MW knows the card because of the serial number at the top of the slab. SGC's serial number is "your invoice number"-"card number on that invoice" which is the stated reason that SGC doesn't have the ability to check cert #s online since it would allow someone to see the sellers entire invoice just by editing the last number. Personally, I think they should offer the online checking. If you do need to verify an SGC cert, email Michael Goldberg at SGC.