Regulations Governing the Customs Clearance of Transit and Transshipment Goods Article 13

Where transshipment containers (goods) approved by Customs for export shipment are stored in the destination warehouse or container terminal, but fail to be exported for any reason and must be returned to the original place of departure, the transport operator, freight forwarder, or ship stores transshipment applicant shall first apply to Customs at the destination for return to the original place of departure, and request Customs officers to escort the transport or approve the carriage with electronic seals attached, before the warehouse or container terminal operator may permit their release from the warehouse (terminal).
中文原文 轉運及轉口貨物通關管理辦法第13條
經海關核准裝運出口之轉口貨櫃(物)於進儲目的地貨棧或集散站後,因故未能出口而須退回原起運地者,運輸業者、承攬業者或船用品轉口申請人應先向目的地海關申請退回原起運地及派員押運或核准加封電子封條載運,貨棧業者或集散站業者方准其提領出棧(站)。

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