An examiner's determination is final for all purposes unless:
(1) the claimant or the person or branch for which the claimant last worked and to whom the copy of the determination is mailed files an appeal from the determination not later than the 14th calendar day after the date on which the copy of the determination is mailed to the last known address of the claimant, person, or branch as shown by commission records;
(2) an examiner files an appeal from the determination within the period specified in Subdivision (1); or
(3) an examiner makes a redetermination as provided by Section 212.054.