The first phone call you fielded that day was about a box that was received at its destination and the contents were not what the label said it should be. The box was labeled "Books" but it contained "Clothing." This is not the first time this has happened. You suspect the boxes may be broken, or maybe the labels are broken. Maybe the conveyor belt is broken; mixing them up after they leave the facility, but that wouldn't explain why a box that was supposed to be "Books" contained "Clothing." But your coworker assures you every time that the boxes are fine, the labels are fine. The conveyor is definitely fine. And you watch as they put the correct contents into the correct boxes, seal them, label them, and send them on their way.