An ex parte search warrant under the Tax Administration Act must not be overbroad; if its terms authorise acts beyond those permitted by the statute or fail to particularise the scope of the search adequately, it is unlawful. On reconsideration under rule 6(12)(c), the court has a broad discretion to uphold, amend, or set aside the warrant, and an appellate court will interfere only if the lower court materially misdirected itself. Where the overbroad warrant has already been executed and the party that obtained it belatedly seeks severance without a proper basis, formal amendment, or notice, the court is entitled to refuse severance and set the warrant aside. A consent order regulating the use of material seized under an ex parte warrant, pending reconsideration, is interim and contingent on the outcome of the reconsideration; clauses permitting the use of documents do not operate as standalone final authorisations if the overall order is framed as interim.