Only buy eBay cards from reliable sellers. Topps has an eBay store called the Topps Vault which has some older cards for sale. If it is not a major company selling the cards, check the comments for that seller. If you read comments like “took 3 months to deliver” or “card was different then pictured card” be wary of the seller. Good comments would include “card was received in 1 week” or " (name of seller) gave me the pictured card".