(1) For the purposes of this Part, a certificate purporting to be signed by the Secretary of the Foreign Affairs Department and stating that a country specified in the certificate is, or was at a time so specified, a Convention country is, upon mere production, receivable in any proceedings as prima facie evidence of that fact.
(2) For the purposes of this Part, a copy of the Gazette containing a Proclamation fixing a date under subsection 2(2) is, upon mere production, receivable in any proceedings as prima facie evidence of:
(a) the fact that Australia has acceded to the Convention; and
(b) the fact that the Convention entered into force for Australia on or before the date so fixed.