[pasqui]

on Friday they handed over the package and didn't make me sign anything.

Perfect DNA material.

In your experience, what is the attitude I need to have? Angry, worried or do I have to stay calm and be kind?

Be calm and simply say you're still waiting for the package to arrive.

Frustration can be generated If they prolong the claim's assessment.

I contacted Amazon. I was kind and showed my frustration. The operator took charge of my case, sent a message to the seller to understand what happened to the package. He told me that I have to wait for the seller to answer, and to rest assured, if the seller does not provide explanations they will make me a refund themselves. Now I have to wait for their email.