When purchasing agricultural land that has been inherited and lacks original registration documents, relying solely on a seller's passbook and 'adangal' entries is insufficient to guarantee clear title. While these documents can help initiate a search for an Encumbrance Certificate (EC), they do not definitively prove ownership. It is crucial to consult a local lawyer specialising in revenue matters to conduct a thorough title search and ensure there are no other claimants or joint occupants before proceeding with the registration.