My blue/brown backpack went missing on Friday 29/11/2019 in the train IR 15 (InterRegio 2533) from Geneva to Lucerne between 18:0 and 21:00. I had placed it on the ovehead shelf and I noticed it disappeard just prior to my arrival to Lucerne. Inside there was a surface tablet (with many of my University courses), a black kindle e-reader, a blue metall waterbottle, chargers, an umbrella. I already filled a lost item report K2019/175783. I received a message that so far it hasn't been found. Could someone tell me if I should go to the police and report it as stolen? IF yes, what are the procedures for doing so?