Well, they produce on site (Little Italy in NY) and import specialties from Italy - I don't know more.
But here, ABE tested various Panettone labels, available here (from Milan and our canton Ticino), and some years ago, the panettone from Marnin, Locarno (TI) got the best mark (Al Porto, p. artigiano, TI, 2nd, and Bauli's famous Motta, Milano, 3rd).
But there's a lot of translation to do - lol.