Postal Remittances and Savings Act Article 24

In case a postal money order is lost or damaged, the remitter or the payee may report the loss or return the damaged postal money order, and, in conjunction with the voiding of the original money order, receive a refund.Chunghwa Post shall refuse to accept applications mentioned in the preceding paragraph for postal money orders that have been cashed or refunded in accordance with the provisions set forth in the preceding paragraph.
中文原文 郵政儲金匯兌法第24條
郵政匯票遺失或毀損,匯款人或受款人得申請掛失或繳回,並領回匯款,原匯票即予作廢。
郵政匯票業經兌領或已依前項領回匯款時,中華郵政公司應拒絕受理前項申請。

English translation for reference only; the Chinese text prevails. Not legal advice.