http://www.storefrontbacktalk.com/social-networks/ohio-wal-mart-giftcard-thief-gets-11k-just-for-the-asking/ has a little more information on this Wal-Mart story, but not much. Here's a couple quotes from the article. I bet Wal-Mart is keeping quiet about it because they're afraid it's going to catch on and start happening everywhere.
"Earlier this month, a man called a 24-hour Wal-Mart in Columbus, Ohio, at 1 AM and told an associate he was with Wal-Mart’s IT department. The caller instructed the associate to activate gift cards, read him those card numbers and then scratch off the tape on the back of the cards so she could tell him the authorization codes, police said. And the associate obliged. Hours—and more than $11,000 in online fraud—later, the store realized it had been had."
"Wal-Mart had yet to indicate how it arrived at the very specific fraud figure of $11,054.60. Nor did the retailer say how many—or the nature of—the transactions involved. A Wal-Mart spokesperson on Wednesday (Sept. 22) also said she had yet to hear back from store officials about the incident’s particulars."