[HeardIt]

ok clear, to me they send a carrier legally blinding document to sign that I didn't received the shipping, but I'm too afraid to sign

Why? You have claimed you don’t have it. So why are you scared to sign something NO ONE will ever know that you have?

If a document is enough to scare you off doing SE, then why even attempt it in the first place?

because i want to resell it, otherwise i would have sign it (and in addiction there is the sign of my doorman, i don't want to involve him)

So if you resell it then you don’t even have any evidence of having it. Now if you return it, it’s going to be blatantly obvious you tried to SE it