Tnx lattesurf for your reply.
There were 2 different types of shipping: normal (few dollars) and "express" (about 30 dollars), plus the possibility of insurance.
I've chosen normal shipping, but I've paid for the insurance, because I was thinking "If the're sure I'll receive the item, they must have a tracking number"
But after the payment they've only confirmed shipping, by mail and on their site.
I tried to contact them, but the only thing they told me is: don't worry, it will arrive.
At the moment, I don't know in which way the insurance can grant me I will receive the item, if I can't track it, and if they don't track it.
I've paid through paypal, so I've the possibility to open an issue, but It would be better if they're would be able to find a way to track my insured shipping.
Hope everything will go in the right way, at the end