1. This is the full tracking of your parcel:
Parcel No.RF258457041CN tracking result
2016-05-25 15:03:51.0 Electronic Data Received
2016-05-28 14:16:29.0 parcel center received
2016-05-28 21:18:30.0 parcel center customs scan
2016-05-28 23:34:26.0 leaving parcel center ，next station Shenzhen center
2016-05-29 00:35:50.0 Shenzhen Transit Station export security scan
2016-05-29 12:04:07.0 Shenzhen Transit Station export customs cleared
2016-05-30 20:33:00.0 arrive Guangzhou Airport
2016-05-30 20:40:49.0 leaving Guangzhou Airport going to next airport/seaport
2016-06-01 12:24:27.0 Shenzhen Transit Station export security scan
2016-06-01 15:26:42.0 Shenzhen Transit Station export customs cleared
2016-06-02 19:32:00.0 arrive Guangzhou Airport
2016-06-02 19:51:11.0 leaving Guangzhou Airport going to next airport/seaport
2016-06-05 10:11:29.0 Shenzhen Transit Station export security scan
2016-06-05 10:49:49.0 Shenzhen Transit Station export security scan
2016-06-05 11:55:39.0 Shenzhen Transit Station export customs cleared
2016-06-06 20:41:00.0 arrive Guangzhou Airport
2016-06-06 20:49:09.0 leaving Guangzhou Airport going to next airport/seaport
2016-06-08 12:38:34.0 Shenzhen Transit Station export security scan
2016-06-08 12:53:22.0 Shenzhen Transit Station import customs cleared (domestic transit )

2. It seems to me that your parcel had difficulty getting out of China and I suspect is still in China, even maybe sent back to the seller.

3. May I suggest you contact seller as soon as possible and provide him with the full tracking above and tell him you have not receive your parcel.

Hope this help.