I hear you. I wouldn't have shipped to Italy myself but the buyer arranged everything from his end. My responsibility stopped at my front door.
By the way, I ship my drivers the same way. Bolted to a piece of plywood, wrapped in plastic and wedged with styro around the outside and multi-layer styro sheets with cutouts for the magnet to keep it stable in shipping. A CD is about the right size for the 8G magnet as a cutting template. It works quite well.