(1) A form of warrant duly completed under subsection 71(6) is authority for the same powers as are authorised by the warrant signed by the issuing officer under subsection 71(4).
(2) In any proceedings, a court is to assume (unless the contrary is proved) that an exercise of power was not authorised by a warrant under section 71 if:
(a) it is material, in those proceedings, for the court to be satisfied that the exercise of power was authorised by that section; and
(b) the warrant signed by the issuing officer authorising the exercise of the power is not produced in evidence.