I contacted the supplier of the goods I purchased and was informed that it was delivered. I haven't received my merchandise yet. Trace code is AS751547276

Im writting you because my package didnt came.
And contact is china post.
Do you have any answer for me why i didnt get the package?
i buy the package on amazon.

My id: 655224789
Juš Dolničar

Thanks for answering my questions

Hello! I see that my package EJ380169482ES is being stopped with the reason of
1) Is it correct that "Merchandise invoice is missing to complete the process"?
2) What is that?
3) To which address do I send such an Merchandise invoice?

My package is not a merchandise, it is birthday present. The probelm is, that some of the things I made myself, and I don´t have an invoice, as i MADE those things myself.
Many thanks for your help!!