Der Täter ist unter uns

A badly lit street; a car driving too fast; squealing tires .... a car crashes into a construction site. When the police arrive on the scene, the driver is gone. In the vehicle, however, the cops find film with photos of the almost worthless stock of the closed-down Motapa Mining Firm. The originals of the stock are in a bank safe, to which only selected employees of the firm have access. So who made these pictures and what is his or her interest in them?