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Best would actually be heaving books around in the stockroom and carrying out the cases to stock shelves -- lots of lifting, stretching, bending. All around good exercise.
But if you don't get to do that and if you just have to stand behind the counter, that's a little harder. I supposed you could stash a light set up dumbbells back there and do bicep curls and dumbbell presses -- or would that be too conspicuous. You might also get one of those spring-loaded grippers for working the forearms; they also make good tension relievers, they're pretty cheap, and if you keep your hands below the counter, no one will know.
If you can drop down behind the counter for a set of 20 pushups every so often, I don't suppose that would be too conspicuous, either. Try doing sets of pushups with your arms wide apart, medium, and close together. Each variation works the upper-body somewhat differently.
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