One listing offered eBay customers an “Authentic CDC Vaccination Record Card” for $10.99. Another promised the same but for $9.49. A third was more oblique, offering a “Clear Pouch For CDC Vaccination Record Card” for $8.99, but customers instead received a blank vaccination card (and no pouch). All three listings were posted by the same eBay user, who goes by “asianjackson” — using an account registered to a man who works as a pharmacist in the Chicago area — and all were illegal, federal regulators say. The account sold more than 100 blank vaccination cards in the past two weeks, according to The Washington Post’s review of purchases linked to it... For months, officials have been a step behind the scammers, who have openly discussed strategies to fake the cards on social media, sold them on sites such as eBay and pulled blank photos off state websites. Federal officials’ decision to use paper cards that can be easily photocopied or even printed off a template, rather than a digital tracking system, worsened those risks. “This is exactly the scenario that you want to guard against. It undermines the entire effort by having falsified cards out there,” said Jennifer Kates, who oversees global health policy for the Kaiser Family Foundation and reviewed asianjackson’s eBay listings. “It certainly bolsters the argument for a digitized mechanism — which isn’t a tamper-proof system, but certainly a more secure one.”