Enforcement Rules for the Controlled Drugs Act Article 15

After the controlled drugs are imported and received the confirmed importing documents sent by the importing countries in accordance with the relevant international treaties; the FDA shall note the names and quantity of the actual imported drugs on the relevant documents, provide confirming signature and return to the exporting country.
中文原文 管制藥品管理條例施行細則第15條
管制藥品輸入後,食品藥物署於收到輸出國政府依國際公約規定發送之確認輸入文件時,應於該文件註明實際輸入藥品品量並簽署後,寄還輸出國政府。

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