1. This is the full tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.RK517604905CN tracking result
2016-10-17 11:35:51.0 常熟parcel Transit Station received
2016-10-17 12:43:13.0 常熟parcel Transit Station customs scan
2016-10-17 17:16:45.0 leaving 常熟parcel Transit Station ，next station 常熟
2016-10-19 08:12:18.0 Suzhou Transit Station export security scan
2016-10-19 10:00:15.0 Suzhou Transit Station export customs scan (domestic transit )
2016-10-29 16:37:31.0 arrive Suzhou city Post Office parcel process center delivery office
2016-10-29 16:41:53.0 Suzhou city Post Office parcel process center 已rejected
2016-10-29 16:41:53.0 Suzhou city parcel process center received
2016-10-29 16:47:42.0 Suzhou city parcel process center customs scan
2016-10-29 18:55:07.0 leaving Suzhou city parcel process center ，next station Suzhou center
2016-10-30 13:22:20.0 Suzhou Transit Station export customs scan (domestic transit )
2016-10-30 16:03:19.0 Suzhou Transit Station export security scan
2016-11-07 17:39:34.0 arrive Suzhou city Post Office parcel process center delivery office
2016-11-07 17:46:40.0 Suzhou city parcel process center received
2016-11-07 17:46:40.0 Suzhou city Post Office parcel process center 已rejected
2016-11-07 17:53:46.0 Suzhou city parcel process center customs scan
2016-11-07 20:37:12.0 leaving Suzhou city parcel process center ，next station Suzhou center
2016-11-11 10:01:21.0 Suzhou Transit Station export customs scan (domestic transit )
2016-11-11 10:43:32.0 Suzhou Transit Station export security scan
2016-11-25 10:17:33.0 arrive Suzhou city Post Office parcel process center delivery office
2016-11-25 10:21:31.0 Suzhou city Post Office parcel process center 已rejected
2016-11-25 10:21:31.0 Suzhou city parcel process center received
2016-11-25 10:29:27.0 Suzhou city parcel process center customs scan
2016-11-25 16:06:01.0 leaving Suzhou city parcel process center ，next station Suzhou center
2016-11-27 09:20:23.0 Suzhou Transit Station export customs scan (domestic transit )
2016-11-27 10:07:53.0 Suzhou Transit Station export security scan
2016-12-03 10:53:01.0 arrive Suzhou city Post Office parcel process center delivery office
2016-12-03 11:04:39.0 Suzhou city Post Office parcel process center 已rejected
2016-12-03 11:04:39.0 Suzhou city parcel process center received
2016-12-03 11:05:17.0 Suzhou city parcel process center customs scan
2016-12-03 17:48:38.0 leaving Suzhou city parcel process center ，next station Suzhou center
2016-12-04 09:13:43.0 Suzhou Transit Station export customs scan (domestic transit )
2016-12-04 10:25:16.0 Suzhou Transit Station export security scan

2. There is something inside the parcel that is triggering a Security or Customs scan rejection.

3. In your parcel is there any of this:

China Post Forbidden Item List

4. May I suggest you contact your seller as soon as possible and tell him that the parcel is having problem. Just give him the above tracking when you contact him.

Hope this help.

1. Here is another tracking for you:
International Mail# RK517604905CN Tracking Result
Summary
Tracking number Origin Destination Status
RK517604905CN CHINA LEBANON On route

History Detail
Local date/time Activity Location Remarks
17-Oct-2016 11:35 Received by Post Office 21556400
29-Oct-2016 16:41 Received by Post Office 21502700
07-Nov-2016 17:46 Received by Post Office 21502700
25-Nov-2016 10:21 Received by Post Office 21502700
03-Dec-2016 11:04 Received by Post Office 21502700

2. As you can see your T Shirt has some problem, this is from the China Post Forbidden Item list:
All items with copyright problem such as pirate CD/DVD, replica brands clothes,shoes and accessories etc.

3. Since the parcel is still in China, may I suggest you open a dispute for non receiving your parcel.

4. If you open a dispute include the above tracking and your previous tracking. If seller does not want to reimburse you, then escalate the dispute.

Hope this help.