1. This is the full tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.RD133852975CN tracking result
2016-12-16 15:40:31.0 宿迁city Post Office parcel 局 received
2016-12-16 15:45:43.0 宿迁city Post Office parcel 局 customs scan
2016-12-16 15:47:41.0 leaving 宿迁city Post Office parcel 局 ，next station 泗洪
2016-12-18 10:48:20.0 Nanjing Transit Station export security scan
2016-12-18 10:55:48.0 Nanjing Transit Station export customs scan (domestic transit )

2. Your parcel right now is traveling to another location in China.

3. You will be very lucky if you get your parcel for New Year.

4. You might want to read this for Serbia:
http://track-chinapost.com/China_Post_Arrival_Time_Stat.php

Hope this help.