This video wasn’t caught on Snapchat — but the New York Stock Exchange really wishes it would disappear. One day in late 2016, executives at the Big Board ordered dozens of regulatory staffers to head down to the trading floor so it looked busier than it really was — an elaborate ruse to impress the chief executive of Snap Inc. as he weighed whether to list the vanishing-photo app maker’s shares there, The Post has learned. NYSE brass hatched the sneaky sham, secretly caught on video by a disgusted employee, after Snap CEO Evan Spiegel remarked during a Nov. 18, 2016, tour of the exchange’s historic building at 11 ... (full story)