Unidentified G.I. holding a painting of the Madonna and Child, at Altaussee, Austria, 1945. Annotations by Lt. Cdr. Thomas Carr Howe on the verso of the photograph: "Altaussee, Summer 1945. A G.I. holding a Sch. of Leonardo da Vinci [Madonna and Child] taken to Görings fury from Monte Cassino. He rejected this painting and many others when they were presented to him by members of his air force. It was not proper to loot the holdings of an ally (Italy). Curious morality!" (Thomas Carr Howe papers, Archives of American Art)
I don’t know about the rest of the Italian stuff, but the pieces from Monte Cassino were saved through one of the few civilized acts of the Wehrmacht. Kesselring and the local commander Von Senger prompted and assisted the Augustinian monks in evacuating the art and archives of the abbey, as it was in the front line and at risk of destruction, and it was in fact destroyed. But much if not all its valuable contents were saved.