For the purposes of this Act, a certificate that:
(a) purports to be signed by the Registrar or other proper officer of an Australian court; and
(i) that a person was convicted by that court on a specified day of a specified offence; or
(ii) that a person charged before that court with a specified offence was, on a specified day, found in that court to have committed the offence but that the court did not proceed to convict the person of the offence;
is, unless it is proved that the conviction was quashed or set aside, or that the finding was set aside or reversed, as the case may be, conclusive evidence:
(c) if subparagraph (b)(i) applies--that the person was convicted of the offence on that day; and
(d) if the offence was constituted by a contravention of a provision of a law--that the person contravened that provision.