USPS routing appears to be crazy.
This is from an UPS-USPS order from Midway. (Shipping charge less than $5 for two magazines.)

N.B. The top entry is the most current, the bottom the oldest.

PHILADELPHIA, PA, United States 11/18/2013 10:29 A.M. Package processed by Post Office
GREENSBORO, NC, United States 11/16/2013 2:26 A.M. Package processed by Post Office
CAPITOL HEIGHTS, MD, United States 11/15/2013 9:58 A.M. Package processed by Post Office
PHILADELPHIA, PA, United States 11/14/2013 11:14 A.M. Electronic Shipment Information Received for Package by Post Office