This is getting silly. It is impossible to go back to birth with some aircraft, the documentation simply isn't there. To cross check every part and every part number would mean dismantling the whole aircraft. But paranioa seems to be gripping some MOs. Is it the case that for example: If a 30 year old spam can crashes into a school/hospital etc, and the cause is found to be something that should have been done 25 years ago. But the people who signed up the ARC are held to be liable? How could they possibly know if no paperwork was available. There has to be a line drawn beyond which no liability can be incurred, and that line is logically the last C of A inspection.