A finder's keeper's scenario...it's optional.
I had this experience last summer at Berlin Hbf. This woman was using a coin phone, (yes, they still exists, several of them at Berlin Hbf), had left her small purse next to her. When finished on the phone, she forgot her purse on the floor. I picked it up, it was genuine, the wallet was there along with the cash, coins, and plastic, etc. I didn't know where the Fundstelle (lost and found) was at Berlin Hbf, wasn't going to spend the time walking around to locate it either.
So, I brought the purse to the DB Informationstelle next to one of the exits. I told them I had found this purse next to a pay phone in the station, they questioned me when, as if they doubted my story, which was gradually ticking me off. Just now about ten minutes ago in the Hbf. They were still puzzled, had that "what do you want me to do with it? " look on their faces of these two DB women.
I almost came close to yelling at them since I was turning this purse in ( diese Tasche abgeben) as a Good Samaritan and they didn't seem very receptive to taking it. Anyway, they took it and presumably contacted the woman owner.