[mothered]

Here in italy i’ve never seen 4kg bottles

Order It online.

I think they will open an investigation with the carrier and mail me that there wasn’t a consolle inside, then i will just insist that i sealed and labeled the box and give it to the guy at the Ups reception, and then wait for microsoft’s decision, right?

It's almost certain that an Investigation will be opened.

Either that, or they'll decline your claim from the get-go.