USPS package doesn't arrive?

USP problem. Hi I made a purchase from eBay on December 13 and was sent to my address in Maryland the same day but it's 20 and i'm not received my package, ebay providedme a tracking number they said the package was shipped on the 13th from Louisiana and came to Nort Carolina 15 but from there the package is not updated in the tracking number, the package is a iPhone 5s and the package is with 50$ of insurance, 2 day shipping. I don't understand why my package has not come yet to my address on Maryland, i talk to USPS and they said my package was actually late and I opened a case but say they don't know anything, really I don't know what to do if you expect more or talk with the seller to return my money.

Added (1). I order a screen protector and a case for the iPhone from another seller from California on December 15 and I received the items yesterday but not the other pack from luisisiana on December 13 had to receive the package in December 16 but nothing my package is on Charlotte NC

Your package is probably late due to the weather and the Christmas rush. All you can do it wait for it. If you want anything to arrive for Christmas that requires shipping it should be ordered as early as possible. Most sites tell you to order before the middle of November to be sure.

The seller won't return the money until they receive the returned item if it gets returned.

The postal service is world wide famous, When some one booking packet for you, they may be send tracking number for you, please check the packet location, Where it is.