The Enforcement Rules of the Specifically Selected Goods and Services Tax Act Article 31

When an imported specifically selected good is exempt from the specifically selected goods and services tax under Article 6, paragraph 1, subparagraph 4 or Article 6, paragraphs 2 or 3 of the Act, an application for tax-exempt importation shall be filed with the customs authority with documentary evidence issued by the competent authority.
中文原文 特種貨物及勞務稅條例施行細則第31條
進口特種貨物適用本條例第六條第一項第四款、第二項或第三項規定免徵特種貨物及勞務稅者,應取具主管機關之證明文件向海關申請免稅進口。

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