Some group called “K Sparkle” is responsible. K Sparkle lists a public business phone number on their Wal-Mart seller profile. The number is registered to ZK Sparkle Enterprises LLC in Florida.
ZK Sparkle Enterprises LLC is owned by Yanqiong Guan and Cai Zhen.
Hackers appear to be using legitimate businesses with online web stores to move stolen documents. This is something that the FBI should probably be looking into but they are too busy worrying about IOTBW posters.