(1) If:
(a) an authorised representative of a carrier has been informed, under section 121, of the issue of a stored communications warrant; and
(b) it is proposed, under the warrant, to access stored communications that, immediately before they became stored communications, had passed over a telecommunications service operated by a carrier; and
(c) the service was not identified in the warrant;
the chief officer must cause that authorised representative to be given, as soon as practicable, a description in writing of the service sufficient to identify it.
(2) If:
(a) an authorised representative of a carrier has been informed, under subsection (1) of the issue of a stored communications warrant; and
(b) the chief officer of the agency to which the warrant was issued, or a certifying officer of that agency, is satisfied that it is no longer necessary to access stored communications that, immediately before they became stored communications, had passed over that service;
the chief officer or the certifying officer must cause:
(c) that authorised representative to be informed forthwith of the fact; and
(d) confirmation in writing of the fact to be given as soon as practicable to that authorised representative.