(1) Stamp duty or similar tax is not payable by Australia Post under a law of a State or Territory in relation to property:
(a) acquired by Australia Post before the commencing day; or
(b) constructed by Australia Post before the commencing day.
(2) Without limiting subsection ( 1), stamp duty or similar tax is not payable under a law of a State or Territory on the registration under a law of the State or Territory of a motor vehicle acquired by Australia Post before the commencing day.