The invoice for imported postal articles should be attached to the outer box or included inside the box for Customs inspection. If the invoice is not attached or included while it is deemed necessary to perform an inspection by Customs, the postal authority shall send a written notice to the addressee requesting him or her to provide an invoice.
If any documents designated by Customs or required to be submitted in accordance with other laws and regulations are not provided, the postal authority shall send a written notice to the sender to provide said documents.