For items lost on an aircraft, contact the airline directly. Here is a link to contact information for all airlines that serve ANC.
To report items that were lost at the security checkpoint or any location within the airport, use this form:
Every airline has its own luggage office located downstairs in the Baggage Claim area. If you are missing bags and the airline’s luggage office is closed, please contact the airline directly. Here is contact information for all airlines that serve ANC.