[mothered]

Now they send me a message where they told me  to fill something like a "hand-written and signed letter of honor" where i have to write that the item is not arrived, then they will send it to the delivery company.

So if I understand well that's not a "police report" but something similar but not close. Btw, I'm going to do it,,,any advice? Just fill it and go ahed?

It's not a PR.

Find out whether It's an affidavit, statutory declaration, or Internal company document/release from liability form.