Is a good source. That metal case was only ever used with their first PGM hardware game, DOJ (and DOJ Black Label). Their 2 later PGM games didn't use it and had every marking on the board and chips that referred to IGS sanded out because they were embarrassed that their games were manufactured by a Chinese company. At least that is the rumor as to why. With the cased-in DOJ they figured people wouldn't open it up I guess. The case had a Cave logo sticker over the screw to deter people from opening it up.