With Christmas just a few days away, the scramble for last-minute gifts is matched only by the rush to ship them. The U.S. Postal Service is well on its way of reaching the projected 15.5 billion cards, letters and packages to be sent and delivered between Thanksgiving and New Year’s Eve. “Saturday is the very last day that we would recommend sending anything first class or priority mail,” said Michael Miles, Postal Service media contact for the Atlanta area.