2. The exemption from taxation referred to paragraph 1 of this article shall not apply to such dues and taxes if, under the law of the receiving State, they are payable by the person who contracted with the sending State or with the person acting on its behalf. Article 33 Inviolability of the consular archives and documents The consular archives and documents shall be inviolable at all times and wherever they may be. Article 34 Freedom of movement Subject to its laws and regulations concerning zones entry into which is prohibited or regulated for reasons of national security, the receiving State shall ensure freedom of movement and travel in its territory to all members of the consular post. Article 35 Freedom of communication 1. The receiving State shall permit and protect freedom of communication on the part of the consular post for all official purposes. In communicating with the Government, the diplomatic missions and other consular posts, wherever situated, of the sending State, the consular post may employ all appropriate means, including diplomatic or consular couriers, diplomatic or consular bags and messages in code or cipher. However, the consular post may install and use a wireless transmitter only with the consent of the receiving State. 2. The official correspondence of the consular post shall be inviolable. Official correspondence means all correspondence relating to the consular post and its functions. 3. The consular bag shall be neither opened nor detained. Nevertheless, if the competent authorities of the receiving State have serious reason to believe that the bag contains something other than the correspondence, documents or articles referred to in paragraph 4 of this article, they may request that the bag be opened in their presence by an authorized representative of the sending State. If this request is refused by the authorities of the sending State, the bag shall be returned to its place of origin. 4. The packages constituting the consular bag shall bear visible external marks of their character and may contain only official correspondence and documents or articles intended exclusively for official use. 5. The consular courier shall be provided with an official document indicating his status and the number of packages constituting the consular bag. Except with the consent of the receiving State he shall be neither a national of the receiving State, nor, unless he is a national of the sending State, a permanent resident of the receiving State. In the performance of his functions he shall be protected by the receiving State. He shall enjoy personal inviolability and shall not be liable to any form of arrest or detention. 14