Okla. Stat. tit. 30, § 30-1-123
Letters of guardianship
Letters of guardianship are evidence of the transfer of the
management or administration of all assets, or the part thereof
specified in the letters, of a ward to the guardian. An order
terminating a guardianship is evidence of transfer of the management
or administration of all assets subject to the guardianship from the
guardian to the ward, or to successors of the ward.