I spoke with my son, who is a Baseball card collector, and he explained to me that trading card authenticity on
ebay has been going on for awhile.
As a seller of a card valued at $200 or more, once a purchase is made, the seller prints off a mailing label to the authenticity service, packages the card and sends it off. The authenticity service reviews the card to guarantee that it is authentic and meets the description of the seller (bent, curled edges, mint, near mint, etc.). The authenticity service then puts the card in a slip and seals with a "tamper proof" hologram label. The authenticity service then mails the card to the buyer.
His understanding is that multi card, bulk card listings are not covered, but he wasn't sure.
From his perspective it has made buying and selling cards on
ebay a much more secure process.
I can definitely see this being a positive for bullion purchases as you cane be sure that what you are buying is real (gold, silver, etc.).
I guess we will see.