Acknowledgement of receipt: sealed envelope handling and form forwarding ensure documented custody and immediate register entries. The Adjudicating Authority or its designated officer must receive the sealed envelope with Form IV, complete and sign Form IV and affix the office seal as token of receipt; upon opening the envelope the Authority must complete and sign Form III, affix the office seal and forward it as acknowledgment of receipt of the reasons and material, and must maintain immediate entries in registers and records documenting receipt and custody of the material.