Imperial Household Agency (institutional record)

This is the Imperial Household Agency's own custodial record for the Three Sacred Treasures of the Japanese imperial regalia, describing the agency's founding, its governance role and its strict policy of non display. As the treasures' official custodian under Japanese law, the agency's own record is the correct source for their custodial status and the institutional rationale for their permanent concealment from public view. Its limit is that it is the holding institution's own administrative account rather than an independent historical or archaeological study of the treasures' claimed ancient origin, a question that cannot be independently verified given the very non display policy the agency itself describes, so any claim about their actual age or material rests on tradition rather than on documented examination.