1. This is the tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.RI942228093CN tracking result
2016-08-11 21:34:42.0 parcel center received
2016-08-11 22:51:14.0 parcel center customs scan
2016-08-11 23:23:08.0 leaving parcel center ，next station Shenzhen center
2016-08-12 00:24:39.0 Shenzhen Transit Station export security scan
2016-08-12 11:47:54.0 Shenzhen Transit Station export customs scan (domestic transit )
2016-08-13 08:49:42.0 Guangzhou Transit Station export security scan
2016-08-13 10:25:25.0 Guangzhou Transit Station export customs cleared
2016-08-14 22:40:00.0 arrive Guangzhou Airport
2016-08-14 22:41:01.0 leaving Guangzhou Airport going to next airport/seaport
2016-08-16 23:21:00.0 arrive Guangzhou Airport
2016-08-18 21:38:00.0 arrive Guangzhou Airport
2016-08-18 21:39:37.0 leaving Guangzhou Airport going to next airport/seaport
2016-08-19 09:51:00.0 Guangzhou Transit Station import customs scan ,remark (rejected )
2016-08-20 08:52:11.0 Guangzhou Transit Station import customs cleared (domestic transit )
2016-08-22 08:51:15.0 Shenzhen Transit Station import customs scan
2016-08-22 10:04:55.0 Shenzhen Transit Station import customs cleared (domestic transit )
2016-09-21 19:36:48.0 arrive parcel center delivery office
2016-09-30 13:28:33.0 parcel center delivered

2. Your parcel did not pass the Export Security or Export Customs Scan or Airline Security Check from China Post. So the parcel was sent back to the seller.

3. You should contact seller and give him the above tracking and say to him that the parcel never departed China.

4. Try to have an arrangement with him or open a dispute.

Hope this help.