The person so authorized may:
(a) audit or examine the books and records and any account, voucher, letter, telegram or other document which relates or may relate to the information that is or should be in the books or records, and make copies of any document which he thinks necessary;
(b) examine any process or method an examination of which may, in his opinion, assist him in verifying the amount of duties payable under this act;
(c) require the owner or manager of the property or business and any other person on the premises to give him all reasonable assistance with his audit or examination and to answer all proper questions relating to the audit or examination, either orally or, should the said authorized person so require, in writing, on oath or by solemn affirmation and, for that purpose, require the owner or manager to attend at the premises with him; and
(d) if, during the course of an audit or examination, it appears to him that there has been a violation of this act or of a regulation, take samples, seize and remove any records, books, accounts, vouchers, letters, telegrams and other documents and retain them until they are produced in any judicial proceedings.