It isn't clear from the article that this leak isn't just current and past employees. They certainly have that many current and somewhat recent past employees.

It isn't clear from the article that this leak isn't just current and past employees. They certainly have that many current and somewhat recent past employees. They may also have SSNs for folks who have commercial accounts. Commercial charge accounts often come with better pricing that a normal retail sale. I doupt they had been collecting retail customers SSNs on a large scale.