If an authorised recipient has custody and control of Commonwealth property relating to a security classified document for the purpose of a federal criminal proceeding or a civil proceeding, the authorised recipient must return the property to the Attorney-General's Department, or a representative of the Attorney-General in the proceeding, within 28 days after the earlier of the following:
(a) the conclusion of the proceeding;
(b) if the authorised recipient is a legal representative who has ceased to act in the proceeding--the recipient ceasing to act in the proceeding.