Shelby White, the New York collector who earlier this year agreed to voluntarily relinquish 10 antiquities from her private collection to Italy, will give up two more pieces to Greece, the Greek culture ministry said Friday. The pieces are a marble sculpture that originally decorated an ancient grave and a bronze vase, both dating from the 4th century B.C. The terms of this agreement were not released, and White’s spokesman Fraser Seitel has not commented. But one can presume that White secured the right to be free of prosecution as regards the rest of her collection. Other major collectors should not feel so safe.