A gun was drawn and it didn’t take long for the parking lot attendee handed over the keys to a BMW and an Audi. A few seconds later, the high-end cars that had been parked in a Downtown Jersey City parking lot were in the wind and out of sight. A few days earlier and a few miles south in Bayonne, Ernie Post was walking his dog and noticed something was missing. His old, beat-up jalopy of a 2002 Ford F-350, the one he used only to get to work and back, was gone from the street. Surely no one would steal that vehicle, he thought. He thought wrong. The truck, stripped and missing its catalytic co…