the transportation in such unsealed means of transport or compartments and under such conditions as they may deem necessary, and endorse the relevant SADC Transit Document accordingly. 3. A means of transport engaged in the transport of goods under the provisions of this Annex shall not at the same time be used to transport passengers unless such passengers and their personal effects are carried in a part of the means of transport which is adequately sealed off to the satisfaction of the Customs authorities of commencement. 4. Nothing may be added or taken from or substituted for goods consigned under cover of a SADC Transit Document at times of offloading, trans-shipment or collecting. 5. The means of transport, together with the respective SADC Transit Document, shall be presented to the Customs authorities at Customs offices en-route and at Customs offices of destination for such administrative action as may be required under the provisions of this Annex. 6. Except where irregularities are suspected, the Customs offices en-route within the Member States shall respect the seals affixed by the Customs authorities of other Member States. Such Customs authorities may, however, affix additional seals of their own. 7. In order to prevent abuse, the Customs authorities may, if they deem it necessary: a) require the means of transport to be escorted through the territory of their country, at the transistor’s expense, when goods are transported in unsealed means of transport; or b) require that examination of the means of transport and their loads be carried out enroute in the territory of their country. 8. An unsealed shipment covered by an appropriate SADC Transit Document shall have only one