1. This is what I found about your parcel:
Number: LT272228875CN
Package Status: In Transit
Destination Country: United States
2016-10-12 19:21 Origin Post is Preparing Shipment, We have received notice that the originating post is preparing to dispatch this mail piece.
2016-10-12 19:21 CHINA, NINGBO EMS, Processed Through Facility
2016-10-11 17:45 CHINA, Acceptance

Origin Country: China
2016-10-12 23:17 Ningbo city, leaving messages to mail centers in Ningbo, Ningbo City Center
2016-10-12 23:17 Ningbo, sent to Ningbo city, leaving San Francisco
2016-10-11 17:45 Ningbo jiangdong courier branch modern decorating City Management Department has been received (embrace cast member name: Li Wenlong, Tel: 15205747398)
Powered by http://www.track-chinapost.com

2. And Also this:
International Mail# LT272228875CN Tracking Result
Summary
Tracking number Origin Destination Status
LT272228875CN CHINA UNITED STATES On route

History Detail
Local date/time Activity Location Remarks
11-Oct-2016 17:45 Received by Post Office 315041
12-Oct-2016 19:21 Departure export customs CNNGBD

3. So from the above tracking we know that the parcel is On Route to USA. Normally it takes 9 days before you can see any movement on the USPS site from the departure from China.

4. At the latest I suspect you will see some movement by next eek for your parcel. You just need to be patient and track your parcel through USPS for any movement.

Hope this help.