I bought the B-42 with the black box attached to the rear. that is if that is the engine that was in the Florida auction. I would sure like to know if there is another with a box. The black box contained nothing, but does look to be of the same age as the engine, with very old screws and a very good fit. I have no idea what it was for. The engine base is original paint. I did strip the cylinders down and repaint them red. But I did not see any traces of red paint under the black. If you have any questions, just ask. It does run beautifully. Brad