Hawk007, did you ever find anything more on this? I just got a Millionaire today and was also wondering about the topper. I have seen one photo of it on a machine. Never have I seen one on a machine in the wild. I have always wondered if the topper was an early run or late run thing. My back box has the key lock in the center of it in the top. On the machines that had the topper was the lock moved to the side of the back box?