Section 180E(1) in The Indian Post Office Rules, 1933
(1)The purchaser of an Indian Postal order shall be entitled to obtain repayment of its value, but not the commission, on presenting the order and the counterfoil at the post office from which the order was purchased within two years from the last day of the month of issue. He shall also be entitled to repayment of its value after two years but not after three years from the last day of the month of issue provided a second commission at the rates prescribed in rule 180-A above is paid.