The Metropolitan Museum of Art in New York will have a team of four experts in charge of tracing the origin of suspicious pieces. The pressure of foreign governments and judicial proceedings against the illegal trafficking of works of art have pushed the museum to a revision of its collections.

In 2008, the Met returned to Italy the famous crater of Euphronius, acquired in 1972 for one million dollars. Last year, it returned 45 objects to various countries, trying to counter criticism that it had not acted with sufficient diligence.