Maria walked quickly back to the metro area and checked around the ticket machines. A cleaner was sweeping the floor nearby. “Excuse me,” Maria said. “Did you see a small black wallet here? It has a silver button.” The cleaner shook his head. “Not today. But people often leave things on that ledge.” He pointed to a narrow shelf beside the machine. It was empty. Maria checked the bin next to the machine and the space between two kiosks. No luck. She tried another shop: “Hello, did anyone hand in a wallet?” The assistant asked a colleague and returned with a sympathetic look. “Sorry.” She stood for a moment and took another slow breath. “Keep moving,” she told herself. She walked back towards Arrivals, scanning the floor and benches as she went. Near the information desk, she asked again. “If…