Forwarding of seized-property retention orders requires sealed confidential envelopes, enclosed acknowledgement slips, and contemporaneous recordkeeping. The authorised officer must index and sign each page of the copy of the retention order and material, include a covering letter, insert an acknowledgement slip inside a sealed inner envelope marked confidential and addressed to the Adjudicating Authority with despatch reference and date, then place that inner envelope inside a sealed outer envelope with an outer acknowledgement slip, and maintain registers and records evidencing transmission.