Go past the wall with the drawers and leave the room through the same doorway by which you entered. You are now in the central room with the free-standing display cabinets. Each cabinet focuses on a different theme, which is indicated both at the top of the display case and on the information panels on the wall.
You will find the next object in the first display case on the right as you enter the room. It is located on the rear side, at the very bottom in a small round window.