Lost Item No.: 1079693 - John F Kennedy International Airport, New York, US

I arrived on Friday 13th October at 10:15pm on BA 1593/AA 1441 at terminal 8. I misplaced my passport case containing , my credit card, my son's passport , my check book and my frequent flier cards. I believe i must have lost it at one of the kiosk at immigration. The passport case is a fabric blue, gold and red and looks and is about 10 inches x 8 inches. what do I do to retrieve it if found at the airport. Many thanks