According to reports, hackers attempted to sell details of 2.2 million hacked accounts, reportedly including credit card numbers, expatriation dates, and security codes on the back of the cards. Sony has claimed that those details were either encrypted or not kept on their PSN servers and they are denying that they ignored offers to buy the info back.
To my knowledge there is no truth to the report that Sony was offered an opportunity to purchase the list, said Patrick Seybold, Sr. Director, Corporate Communications & Social Media. The entire credit card table was encrypted and we have no evidence that credit card data was taken.
Source: New York Times
