CY583832793DE arrived in Guangzhou customs on April 9. It waiting for receiver's action to make customs clearance and duty payment. Did you write receiver's mobile phone number in the parcel? If not, you need ask receiver to call China Post hotline 11185 and ask for a customs clearance code. He can use the code to make customs clearance by APP.

Quote from [email protected] on May 2, 2024, 09:40
Thank you for your message. Yes, I wrote the number of the receiver in the parcel. Does the receiver need to pay or do something? Because I paid 50 euros for the shipping and insurance...

Receiver needs to make customs declaration first. Customs will decide if he need to pay duty based on his declaration and government assessment.

Quote from [email protected] on May 4, 2024, 05:33
So do I have to tell the receiver that the parcel is in Guangzhou?

yes. you need to ask receiver to call 11185 and get help to clear the customs. Is this a return for refund?