At the time of my research, librty was also selling a method in these forums that he claimed to NOT be black hat, and one that user Gyfts reviewed and verified to be legitimate. I had assumed that he was using this method, and that they were likely not purchased using a stolen card.

Link: https://bitcointalk.org/index.php?topic=1239892.msg12968710#msg12968710

I apologize for any typos: using my phone.