It has been reported that two statues stolen from collections in Italy have been returned ("Italy announces return from US of 2 stolen statues", New York Post November 19, 2010; "Eagle-eyed officer helps return stolen art to Italy", BBC News November 19, 2010). The marble female torso had been stolen from a museum at Terracina in 1988. It was spotted by off-duty Carabinieri officer, Michele Speranza, in an antiquities gallery in Madison Avenue. He recognised it from the image database of stolen items.
The bronze head of Zeus was stolen from the Museo Nazionale, Rome in 1980. It had resurfaced at an auction at Sotheby's in 2006 and was found in a New York collection.
I am grateful to Katie Downey for alerting me to the story.