Regulations Governing the Handling of Mail Article 57
The following mail items that have been delivered may not be handed over to the post office for return:1.Letter-post items which appear to have been opened.2.Value-declared or insured mails.3.Parcels.
中文原文 郵件處理規則第57條
已遞交之下列郵件，不得交由郵局退回：
一、有拆過痕跡之函件。
二、報值或保價郵件。
三、包裹。
一、有拆過痕跡之函件。
二、報值或保價郵件。
三、包裹。