I don't think it quite accurate to call the tomb St. Nicholas's final resting place. His relics had been disinterred and kept in an Orthodox Church for the veneration of the faithful from sometime shortly after his death until Italians from Bari stole them at took them to Italy sometime after the Turkish conquest of Asia Minor. In the late 20th century, a portion of the relics, the saint's right hand, was returned to the Orthodox Church by the Pope of Rome as a goodwill gesture, and it was decided that its reliquary should be maintained in the St. Nicholas Shrine Church in Queens, New York (my wife's childhood parish).
It's still there for the veneration of the faithful, though it wasn't always. At some point soon after it arrived, the hand was stolen. This offended the Mafia (who had connections to Bari), and word went out on the street in New York: "The hand of St. Nicholas will be returned." It was.