Orly Taitz has a copy of the signed app which proves he signed a lie claiming he never used any other name. You can access it at her website. Phil Berg also has a copy of the document, so it isn’t exactly ‘sequestered’.
I thjought Orly Taitz had an Obama relative in the military that could request a copy of his HI BC. Relatives can request them. I have not heard any more on if she really had a relative.