Quote from ferry_rz on December 15, 2016, 01:17
Dear Sir, need your help about track number 71648495885. already 2 weeks still in custom. Thanks

1. This is the tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.71648495885 tracking result
2016-12-01 22:22:39.0 Guangzhou Transit Station export security scan
2016-12-07 13:58:07.0 Guangzhou Transit Station export security scan

2. I suspect your parcel is having difficulty passing the export security scan.
You might want to read this:

China Post Forbidden Item List

and this:

What does the status “Export Security Scan” mean? How long it will take?

3. You might want to advise the seller that the parcel seems to have difficulty passing the export security scan in Guangzhou. When you contact seller, please provide him with the above tracking of the parcel so he can understand your concern.

Hop this help.