sdandrea1 The only explanation is "USPS sucks"
USPS may not have had a chance to screw this one up yet if they have actually not received the package. Many USPS clerks will not scan a prepaid package unless you request a scan so it won't show up in the system unless it gets scanned along the way. The shipper is likely the issue here but the 6th and 7th were weekend. And if it is actually delivered to the PO today tracking may not show up in the system until tomorrow.