(a) Letters of guardianship issued as prescribed by Section 1106.001 under the court's seal by the clerk of the court that granted the letters are sufficient evidence of:
(1) the appointment and qualification of the guardian; and
(2) the date of qualification.
(b) The court order that appoints the guardian is evidence of the authority granted to the guardian and of the scope of the powers and duties that the guardian may exercise only after the date letters of guardianship have been issued under Section 1106.001.