Here is the tracking result from USPS:
2016-12-03 05:20 Origin Post is Preparing Shipment, We have received notice that the originating post is preparing to dispatch this mail piece.
2016-12-03 05:20 CHINA, SHENZHEN EMS, Processed Through Facility
2016-12-01 21:05 CHINA, Acceptance

It's not arrived in US now. Maybe it's delayed by xmas.

Hi Bridget Fleming,

Your package has been in US now. USPS is processing it and will deliver it to you in the next few days:

Latest tracking result:
2016-12-26 03:28 FOX VALLEY, IL 60599, Arrived at USPS Facility, Your item arrived at our USPS facility in FOX VALLEY, IL 60599 on December 26, 2016 at 3:28 am. The item is currently in transit to the destination.
2016-12-26 01:02 ISC CHICAGO IL (USPS), Processed Through Facility