Dunno where the stores were. B&N notified credit card processors and the FBI.
http://www.nytimes.com/2012/10/24/business/hackers-get-credit-data-at-barnes-noble.html?_r=2&
http://www.wired.com/threatlevel/2012/10/barnes-and-noble-pos-hack/
http://www.nytimes.com/2012/10/24/business/hackers-get-credit-data-at-barnes-noble.html?_r=2&
http://www.wired.com/threatlevel/2012/10/barnes-and-noble-pos-hack/