1. This is the tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.RK534202252CN tracking result
2016-11-20 14:59:57.0 Nanjing city Post Office Parcel AD Dept. received
2016-11-20 15:13:15.0 Nanjing city Post Office Parcel AD Dept. customs scan
2016-11-20 18:17:11.0 leaving Nanjing city Post Office Parcel AD Dept. ，next station Nanjing center
2016-11-21 09:45:11.0 Nanjing Transit Station export security scan
2016-11-21 13:44:03.0 Nanjing Transit Station export customs cleared
2016-11-22 08:58:00.0 arrive Nanjing international
2016-11-22 08:58:52.0 leaving Nanjing international going to next airport/seaport

2. In normal condition parcel to your country Italy can take maximum 28. But when your parcel was sent, it was not normal condition, so your parcel might have been delay because of this:

Holiday Season
China Post has too many parcels to send overseas
Not enough room on the Aircraft for parcels
Rescheduling of mail bags

3. May I suggest you contact seller and tell him you have not receive your parcel. He might be able to call China Post to find out more information about your parcel.

4. Please provide seller with the above tracking do he understand your problem.

Thanks.