When it comes to professionalism and satisfaction guaranteed, USPS is not the place for it. You could look, but you're more likely to find gold between your legs with a leprechaun trying to steal it. What does Guaranteed Delivery Day mean to them? Nothing apparently. When they told me 3:00pm delivery on March 19, 2015, I said okay. at 3:01, I gave em a break. at 3:38, felt a bit of concern. 4:00, annoyance began to creep in. 7:01pm, they officially suck. They are the WORST.