1. This is the full tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.RS136841875CN tracking result
2016-08-30 15:40:49.0 parcel center received
2016-08-30 22:20:20.0 parcel center customs scan
2016-08-30 23:02:13.0 leaving parcel center ，next station Shenzhen center
2016-08-31 00:16:50.0 Shenzhen Transit Station export security scan
2016-08-31 13:16:43.0 Shenzhen Transit Station export customs cleared
2016-09-01 09:45:00.0 arrive Shanghai Int'l Airport
2016-09-01 10:12:14.0 leaving Shanghai Int'l Airport going to next airport/seaport

2. May I suggest you read this for Italy:
http://track-chinapost.com/China_Post_Arrival_Time_Stat.php

3. Your parcel is fine as far as I can see, you could if you want maybe to contact seller and tell him, you have not receive the parcel. He might be able to call China Post to find out what is wrong with the parcel.

Hope this help.