The Under Secretary for Benefits, Veterans Benefits Administration, Regional Counsels, and facility heads are authorized to make disclosures to courts of competent jurisdiction of such files, records, reports, and other documents as are necessary and proper evidence in proceedings in the nature of an inquest into the mental competency of claimants and other proceedings incident to the appointment and discharge of guardians, curators, or conservators to any court having jurisdiction of such fiduciaries in all matters of appointment, discharge, or accounting in such courts.