1. This is the tracking that I found:
Number: LK115864544CN
Package Status: In Transit

Destination Country: United States
2016-12-23 21:51 Origin Post is Preparing Shipment, We have received notice that the originating post is preparing to dispatch this mail piece.
2016-12-23 21:51 CHINA, SHENZHEN EMS, Processed Through Facility
2016-12-22 20:48 CHINA, Acceptance

Origin Country: China
2016-12-24 02:22 Shenzhen, left Shenzhen to Shenzhen postal courier company (Hong Kong) business unit
2016-12-24 02:22 Shenzhen, away from Shenzhen to Chicago
2016-12-22 20:48 Shenzhen, Shenzhen postal courier logistics company's international business branch has been received (the embrace cast member name: gaoyong, Tel:)
======================================
Powered by http://www.track-chinapost.com

2. Your parcel is On Route/In Transit to USA. The parcel travel to Hong Kong then to Chicago. I would not be surprise that your parcel got delayed because of the Holiday Season.

3. Your seller is right, normally parcel to USA can take between 9 to 23 days. But when your parcel was sent it was not normal condition.

4. Just continue to track your parcel on the USPS site for any new movement.

Thanks.

1. Because there is no flight number attach to your parcel nobody know exactly where your parcel is.

2. Now what needs to happen is USPS in Chicago scan your parcel on arrival or when they have time to do it.

Thanks.