1. This is the full tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.03591217516 tracking result
2016-08-24 08:54:04.0 Electronic Data Received
2016-08-27 14:38:18.0 开平city Post Office 广告公司 received
2016-08-27 18:39:00.0 开平city Post Office 广告公司 customs scan
2016-08-27 18:40:00.0 leaving 开平city Post Office 广告公司
2016-08-29 08:52:29.0 Guangzhou Transit Station export security scan

2. The meaning of the last tracking can be found here:

My parcel stuck in “Export Security Scan” “Export Customs Scan” for long time, how can I do?

3. You may want to look at this also:

China Post Forbidden Item List

4. You need to wait 1 week, then you could contact seller If there is no more tracking and tell him the parcel is stuck in Guangzhou Transit Station export security scan. He might be able to call China Post to find out about your parcel.

5. Also please note, that the parcel sent to you was mail by what is call China Post Ordinary Small Packet Plus and sometimes the tracking in China Post is limited. Also you will not be able to tracking this parcel in Italy and will be deliver by the Italian Post just like a normal letter. This type of parcel can take from 30 to 60 days for delivery.

Hope this help.

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Quote from simone on September 8, 2016, 07:13
Hello!
i contacted the seller to ask him to call china post for my parcel ( it is a lightbulb). He told me that it is slow because of the G8, shall i believe this?
When shall i contact him again, if the package is not moving?
Thank you so much for your help!

1. You could wait another week because he might be right about the G20 summit. But I'm also afraid that the parcel with the light bulb might be the problem for China Security and Customs check.

2. If no movement to your parcel, then maybe think of opening a dispute but give a chance to the seller.

Hope this help.