(a) When a person who is appointed guardian has qualified under Section 1105.002, the clerk shall issue to the guardian a certificate under the court's seal stating:
(1) the fact of the appointment and of the qualification;
(2) the date of the appointment and of the qualification; and
(3) the date the letters of guardianship expire.
(b) The certificate issued by the clerk under Subsection (a) constitutes letters of guardianship.