If memory serves me correctly, I think Kodak did sell them in the 60's--80's. They were yellow plastic with Kodak embossed in several places. I also think Fuji made them available to dealers in the 80's, green plastic. Most camera stores just had them made from wood. When I setup a 1 hour lab in the early 90's I just made one, painted it white. I also think I have seen them made of cardboard. As to the shape, it is an efficient use of space for little boxes. The shape was also used in other stores, hardware, hobby, drugstores, sporting goods, etc.