3. The office of departure may do without sealing when, in view of other possible measures taken for identification, the description of goods in the Inter-States Road Transit Declaration allows identification. Article 16 1. The transportation of goods shall be carried out under the cover of the Inter-States Road Transit Booklet. 2. Transportation shall be carried out through the offices indicated on the Inter-States Road Transit Declaration. However, when justified by circumstances, other passage offices may be used as directed by the appropriate authority. 3. In each office open for transit, an official register shall be kept to register, in chronological order, all transit operations effected with reference to the number of ECOWAS/ISRT Log-Book. 4. The Inter-States Road Transit Declaration leaflets shall be presented in each Member State whenever demanded by the Customs authorities which shall ensure that the sealings are intact. Except in cases where foul play is suspected, the Customs authorities of Member States shall respect the sealing done at the office of departure. Article 17 At each transit office, the transporter shall present, on his arrival, the cargo as well as the Inter-States Road Transit Booklet. Article 18 The transit office shall : 1. ensure that it is included in the list of transit offices indicated on the Inter-States Road Transit Declaration ; 2. check to see that the sealings are in order ; 3. not carry out a check on the goods unless it suspects irregularities which may give rise to foul play ; 4. put its stamp on all Inter-States Road Transit Declaration leaflets and transit notices that are presented ; 5. keep back one of the transit notices presented to it by the transporter and give back to the latter all the Inter-States Road Transit Documents as well as the remaining transit notices ; 6. shall affix its seal on its part of the declaration of discharge and return the log book to the transporter. The annotated discharged leaflet shall be addressed to the corresponding office of undertaking for checking. Article 19 When, in accordance with the provisions of paragraph 2 of Article 6, transportation takes place unavoidably through a transit office other than the one mentioned to the Inter-States Transit Declaration and the transit notices, the transit office used shall find out from the transporter the reason for changing his itinerary, state the reasons given briefly on the document presented to him, apply the provisions of Article 18 and immediately send the transit to the transit office which ought normally to have been used and which appears on the document in question. Article 20 Goods listed on Inter-States Transit Declaration may, without any need for the renewals of the declaration, be transferred to another means of transport under the supervision of the Customs authorities of the