In "Chuck Versus the Helicopter" at the beginning of the episode Chuck, Casey and Morgan are chasing a shoplifter through the car park outside of the Buy More. Casey manages to tackle him and takes him back to the Buy More. He is clearly an old nemesis for Morgan, who taunts him as he is hauled away.
In Chuck Versus the Webisodes 1, whilst Casey is talking to the Instructional Video Director explaining about his "unofficial" that has helped him almost eliminate shoplifting from the Buy More. To demonstrate his three strike policy, he knocks out a Buy More shop lifter with the apple he was eating.