Found black leather briefcase with gold accents and monogram near Potsdam train station.

I found a black leather briefcase around the Potsdam train station yesterday evening. It has some gold accents and a monogram on the side that I couldn't quite make out. It was just sitting there, and I thought it must belong to someone. I took it with me hoping to find the owner since it looked quite valuable. There were some papers inside, but no name or contact info.