Regulations Governing the Handling of Mail Article 24
When prompt delivery mail is delivered to a post office box or bag leased to the addressee, the date and time of delivery shall be the date and time it is dropped into the post office box or bag.
中文原文 郵件處理規則第24條
限時郵件投入收件人向郵局租用之專用信箱或專用信袋者，以其投入時間為送達時間。