Firstly, stop sending internationally - there are just too many delays.

Secondly, Italy is one of the worst places to sell to - they have a very high rate of "missing" items.

If you're going to continue to send internationally, then I recommend you move out your handling time to the maximum of 30 days, so it gives you a buffer.

My understanding is that as long as you have tracking and sent it within your handling time, you "should" be covered by Ebay.

Have you actually uploaded the tracking number into the case?