The Regulations Governing Permission and Management of Guns, Ammunition, Knives and Weapons Article 10

The manufacturer as prescribed in the preceding paragraph, after firing the standard center fire blank ammunition imported in accordance with the preceding Article, shall check the cartridge cases, place them under collective storage, and report them to the local municipal, county (city) police department for inspection, after which they will be disposed of.
中文原文 槍砲彈藥刀械許可及管理辦法第10條
前條廠商於擊發使用依前條規定許可進口之制式中央底火空包彈後,應清點其彈殼並集中保管,報請所在地直轄市、縣(市)警察局辦理查驗,並於辦理查驗後銷毀。

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