authentication
the holders of the slabbed cards are being authenticated, the cards are not being re-authenticated....still I think it is a waste of time for slabbed cards in the newer, better, security holders....but perhaps authenticating holders of the cards encased in older, non security holders needs to be done to be sure the holders have not been tampered with...assuming the "authenticators" know what they are doing and what to look for....
Bruce Perry
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