4. In the event of the death of a member of the mission not a national of or permanently resident in the receiving State or a member of his family forming part of his household, the receiving State shall permit the withdrawal of the movable property of the deceased, with the exception of any property acquired in the country the export of which was prohibited at the time of his death. Estate, succession and inheritance duties shall not be levied on movable property the presence of which in the receiving State was due solely to the presence there of the deceased as a member of the mission or as a member of the family of a member of the mission. Article 40 1. If a diplomatic agent passes through or is in the territory of a third State, which has granted him a passport visa if such visa was necessary, while proceeding to take up or to return to his post, or when returning to his own country, the third State shall accord him inviolability and such other immunities as may be required to ensure his transit or return. The same shall apply in the case of any members of his family enjoying privileges or immunities who are accompanying the diplomatic agent, or travelling separately to join him or to return to their country. 2. In circumstances similar to those specified in paragraph 1 of this article, third States shall not hinder the passage of members of the administrative and technical or service staff of a mission, and of members of their families, through their territories. 3. Third States shall accord to official correspondence and other official communications in transit, including messages in code or cipher, the same freedom and protection as is accorded by the receiving State. They shall accord to diplomatic couriers, who have been granted a passport visa if such visa was necessary, and diplomatic bags in transit, the same inviolability and protection as the receiving State is bound to accord. 4. The obligations of third States under paragraphs 1, 2 and 3 of this article shall also apply to the persons mentioned respectively in those paragraphs, and to official communications and diplomatic bags, whose presence in the territory of the third State is due to force majeure. Article 41 1. Without prejudice to their privileges and immunities, it is the duty of all persons enjoying such privileges and immunities to respect the laws and regulations of the receiving State. They also have a duty not to interfere in the internal affairs of that State. 2. All official business with the receiving State entrusted to the mission by the sending State shall be conducted with or through the Ministry for Foreign Affairs of the receiving State or such other ministry as may be agreed. 3. The premises of the mission must not be used in any manner incompatible with the functions of the mission as laid down in the present Convention or by other rules of general international law or by any special agreements in force between the sending and the receiving State. 13