your federal ein number is used by the irs to identify you as a tax paying business entity and many people think of a tax id or ein number as their business social security number
The largest art theft in world history occurred in Boston on March 18, 1990 when thieves stole 13 pieces, collectively and altogether worth $500 million, from the Isabella Stewart Gardner Museum. Among the pieces stolen was Vermeer's The Concert, which is considered to be the most valuable stolen painting in the world.
A few reputable news sources listed Cyber-Stein and Crush Card Virus as the two most valuable cards as of today. So I highly doubt that these cards are worth as much as some of the lists say they are. The list I found them on is also clearly outdated because it listed Cyber-Stein at $4,000, Gold Sarcophagus at $2,200, Des Volstgalph at $1,900 and Shrink at $1,600.