8.—(1) Upon the discharge by a person assessed to the levy of his liability under an assessment, the Board shall if so requested issue to him a certificate to that effect.
(2) The production in any proceedings of a document purporting to be certified by the Secretary of the Board or any other person, being a member, officer or servant of the Board authorised to act in that behalf, to be a true copy of an assessment or other notice issued by the Board, or purporting to be a certificate such as is mentioned in the foregoing paragraph of this article, shall, unless the contrary is proved, be sufficient evidence of the document and of the facts stated therein.