1. This is what I found for you:
International Mail# RF294185054CN Tracking Result
Summary
Tracking number Origin Destination Status
RF294185054CN CHINA GERMANY On route

History Detail
Local date/time Activity Location Remarks
12-Jul-2016 10:17 Received by Post Office 47300221
13-Jul-2016 09:25 Departure export customs ZHENGZHOU

Summary
Tracking number Origin Destination Status
RF294185054CN CHINA CHINA On route

History Detail
Local date/time Activity Location Remarks
19-Aug-2016 10:50 Arrival Import customs BEIJING

2. I suspect your parcel was refused entry to Germany by possibly Germain Customs Officer and the parcel was sent back to sender in China.

3. You should contact sender to make some arrangement with him. Here is a full tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.RF294185054CN tracking result
2016-07-09 22:58:00.0 Electronic Data Received
2016-07-12 10:42:13.0 南阳city 大宗parcel 集中shipping center received
2016-07-12 18:25:00.0 南阳city 大宗parcel 集中shipping center customs scan
2016-07-12 18:36:00.0 leaving 南阳city 大宗parcel 集中shipping center
2016-07-13 09:12:52.0 郑州Transit Station export security scan
2016-07-13 09:22:13.0 郑州Transit Station export customs cleared
2016-08-04 17:54:00.0 Niederaula export customs cleared
2016-08-19 10:50:07.0 Beijing Transit Station import customs scan
2016-08-19 16:15:29.0 Beijing Transit Station import customs cleared (domestic transit )
2016-08-21 14:51:49.0 郑州Transit Station import customs scan
2016-08-21 16:58:05.0 郑州Transit Station import customs cleared (domestic transit )
2016-08-24 15:13:53.0 arrive 镇平县县城投递班 delivery office
2016-08-24 15:36:55.0 镇平县县城投递班 attempt delivery
2016-08-24 18:34:15.0 镇平县县城投递班 delivered

4. When you contact seller give him the above full tracking , if you have no response from the seller, then open a dispute and include all contact you had with seller as proof that you did not received the parcel.

Hope this help.

So it's basically showing that it's arrived back at original destination?

Thanks guys