what does "vouch for bona fide"mean? There were some stragglers. The two press buses unloaded as scheduled between the Furniture Mart and the Apparel Mart, on Industrial Boulevard; the bulk of the White House press corps showed their Polaroid identification cards, entered the Trade Mart, and heard the news either from officers or luncheon guests who had picked up Merriman Smith's flash over transistor radios. Among the last to learn that anything had gone awry were the passengers of the hapless VIP bus. They had been instructed to go directly to the rear of the Trade Mart. But there were no Dallas policemen at the rear entrance. The guards were Texas state policemen who weren't tied into the radio network and didn't know what had happened. None of them, moreover, had ever seen a White House pass. They had been told that Secret Service agents would vouch for bona fide Kennedy people. But most of the agents had left for Parkland after picking up Kellerman's distress signal over the Charlie network.