Berlin has a central lost and found office located at Tempelhof airport (Platz der Luftbrücke 6). It has limited opening hours, but you can call (030 7560 3101) to see if your gear has been turned in by some good Samaritan. The public transportation operator BVG also has a lost and found office on Potsdamer Strasse, which is open Monday to Friday (030 19449).