(Ron Dauphin)What’s a postal worker to do when a company that isn’t the United States Postal Service starts offering USPS products and using its own employees to sell those services? Prepare to protest, which is what the American Postal Workers Union is going to do on Thursday at 50 Staples stores. Staples has been selling traditional mail services and products at 82 of its stores since November in a “pilot project” scheduled through September.