I believe that UPS is the "originator" for these shipments, i.e. they were delivered to UPS from Samsung, cleared customs, loaded with carrier specific items (if required), and then shipped out without ever going to Sprint. A lot of online phone orders are handled in this way. For this reason a large majority, if not all, of the pre-ordered phones will ship from Louisville, aka the home of UPS. Sprint likely ships them 2-day but since UPS is doing everything, they are probably delivered the next day (hopefully). FedEx actually has a division that repairs iPhones and other electronics and returns them without them ever going to an Apple store.