Regulations Governing the Bonding Operations in Science Parks Article 21

In the event that the goods regarded as exported goods are to be returned to the seller for any reason, the buyer and the seller shall, within three months after the entry of the goods into the factory, jointly fill out an application for returning goods with the Customs for its approval; the certificate for such regarded export originally issued shall be withdrawn and revoked or amended; relevant authorities shall be notified of such withdrawal, revocation or amendment and proceed accordingly. Only when the amount of duties and taxes, which were offset, refunded, exempted or deducted, have been paid back, and a notice of such tax pay-back has been given to the competent tax authority can such returned goods be released from the Park.In the case the return of goods set forth in the preceding Paragraph occurs beyond three months after the entry of such goods into the factory, the park enterprise shall fill out a customs clearance application and complete the customs clearance procedures with the Customs in accordance with the procedures for import of ordinary goods, and import duties and taxes shall be levied thereon in accordance with the relevant laws.Upon occurrence of return of the goods regarded as exported and imported goods under the preceding Article, the seller and the buyer shall jointly fill out an application for returning goods and file the same together with necessary documents for clearance of goods with the Customs for customs clearance.
中文原文 科學園區保稅業務管理辦法第21條
視同外銷貨品發生退貨情事時,應於進廠後三個月內由買賣雙方聯名填具退貨申請書,報經海關核准;原已核發視同出口證明文件者,應收回註銷或更正,並通知有關機關註銷或更正。
已辦理沖退或減免稅捐者,應繳回已沖退稅款並通知所屬稅捐稽徵機關,始可退貨出區。
進廠三個月後發生之退貨案件,應繕具報單依一般貨品進口之規定辦理通關手續,並依法課稅。
前條視同出口及進口貨品發生退貨情事時應由買賣雙方聯名繕具報單,檢附報關必備文件,向海關辦理通關手續。

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