Enforcement Rules of Medal Award Act Article 17

If the Medal or the Certification is lost, the awardees can apply for it to be reissued from the Awarding Agency with the approval of the Relevant Yuan. If the original is found, it should be processed in accordance with the Regulations on Medals Lost and re-issued.
中文原文 獎章條例施行細則第17條
獎章或證書如有遺失,得由領受人敘明理由,函請原請頒機關層報主管院補發。
如原件查獲時,應比照勳章遺失補發辦法有關規定辦理。

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