IT WAS one of the most audacious heists in art history. On Christmas Eve 1985 125 Mayan, Aztec, Miztec and Zapotec artefacts were stolen from the National Museum of Anthropology in Mexico City. Some suspected that it was the work of the KGB or the CIA, a gang of professional crooks from Guatemala or Colombia or a “psychotic millionaire cultist” who wanted to “gaze on the booty in solitude”, as a news report from the time put it. Across the country the populace watched aghast as newscasters relayed an official message warning them . . .