(Robert Martin)Back in October, big-box office-supply retailer Staples announced that it was investigating a possible customer payment data breach. The results of that investigation are in: yes, the payment systems of some Staples stores were breached. While there was some speculation last month that this breach may have been linked to the one at craft retailer and fellow big-box tenant Michaels, it turns out that the two breaches weren’t related, according to security blogger Brian Krebs. Staples says that about 115 of its stores were hit in this breach, out of a total of 1,400 stores in the chain.