[quote name='MauMauProductions']What could someone even do with the number[/quote]
Call customer service, give them the order number, shmooze a little, get account info ("which cc did I use?", "what do you have down for my address?"), possibly cancel the order (which most likely won't make much difference in this instance), or, at the very least, check order status hundreds of times, each one generating an annoying email to him.
As they say, "Just because you're paranoid, doesn't mean they aren't out to get you."