They tiptoed out with a historic haul of $30 million cash in possibly untraceable bills. It had to be a " sophisticated" group, officials say. Not just any burglars can access the building and enter the vault without setting off the alarms. To the cops, that smells a lot like an inside job, so they're diligently running down the hunch. Largest cash heist On Easter Sunday, after the sun went down, somebody