You hit the nail on the head. Every standard forensic airline crash investigation requires an inventory of the parts recovered. Furthermore, each part is tagged with a serial number that is logged and matched to the actual airplane that crashed. This standard procedure was never conducted with any of the 4 9/11 airplanes in question, not even with any of the allegedly recovered flight recorders. Photos of alleged parts are not proof that those parts actually belong to the planes in question. To answer your question, there exists no verification whatsoever and the reason is that no forensic airplane crash investigation was ever conducted in the first place. - - - Updated - - - We posted concurrently lol.