It is indeed embarrassing that it's been four plus years and we have bupkis on the pipe bomber ID. Despite a substantial reward offer. Despite the FBI being the undisputed world class investigative agency. Despite this attempted bombing taking place in one of the most surveilled cities on the face of the earth.
You have to be of Roundy level IQ to believe that the FBI was simply flummoxed by a suspect who was caught on camera at the scene and on the get away route.