9.—Section 21 (2) of the Principal Act is hereby amended by the insertion after “this Act” of the following: “, and may seize any firearms found in any such place to which a mark, being a mark mentioned in section 4 (1) (a) or 4 (1) (b) of the Firearms (Proofing) Act, 1968, has not been applied and in relation to which he reasonably believes or suspects that a breach of an order under the said section 4 has occurred”.