I'm not saying possessing stolen credit card #'s isn't against the law. But, most information laws are not based on theft laws. Copyright infringement, for example, is infringement, not theft. Judges have become upset when lawyers begin to use the word "theft" in their courts, because legally, copyright infringement has nothing to do with theft.
Theft of credit card information is more like theft of trade secrets than copyright infringement.
That said, I'm not saying that possession of stolen credit card numbers is against the law. I couldn't find any law against possession in itself, only possession with intent to defraud.