The New York Post may have uncovered New York’s next great security threat: a retired locksmith living in Union City, just beyond the Lincoln Tunnel. Sixty-nine-year-old Daniel Ferraris has set up shop on eBay selling FDNY and electrician master keys, which are designed to open everything from light boxes to subway entrances. They also allow the user to shut down skyscraper elevators and provide access to practically every construction site in the city. For $150 Ferraris handed them off to an undercover reporter, who tested them out and found most to be in working order.