Late one night 30 years ago, while the city of Boston was celebrating St. Patrick’s Day, it took 81 minutes for two thieves dressed as police officers to execute what is still the most expensive fine art heist in the world.Late one night 30 years ago, while the city of Boston was celebrating St. Patrick’s Day, it took 81 minutes for two thieves dressed as police officers to execute what is still the most expensive fine art heist in the world.