Backpack Left Onboard

You left a backpack on the train home from university yesterday evening. It contains your student ID, a library book and the notes for an assignment due next week. You have come to the station's customer service office. Speak to the staff member: describe the bag and where you left it, and ask how you can get it back.

Hi, I'm hoping you can help. I left my backpack on the train yesterday evening, around six o'clock, on the service from the university station into the city. It's a dark green backpack with an Australian flag badge on the front pocket. Inside there's my student ID, a library book, and the notes for an assignment that's due next week, so I'm anxious to get it back. Has anything like that been handed in? If not, could you tell me how to lodge a lost property report, and how long it takes? Thank you.