The number of the card should tie back to an account holder. This is not an anonymous card, merely a card lacking on a name. Outside of the US wealthy foreign nationals do to this, request nameless statements and that statements are to be sent to some obscure address to conceal their wealth. Not necessarily in a bad way either. There are certain countries were wealthy people are kidnapped and then ransomed.
"100 victories in 100 battles isnt the most skillful. Subduing the other's military w/o battle is the most skillful." Sun-Tzu