There's nothing more annoying than having cart-only copies of games. In the case of the PC Engine, they came in jewel cases, so replacing a missing case is as easy as printing out a replacement and popping it into a new jewel case (although, without the tray that holds the game card, though I hear someone is making reproductions of these). But you need to get a hold of the scans first! I've been able to find a few online for some games, but I'm missing two of them: Super Momotaro Densetsu II and the System Card v2.1. Does anyone know where I can find scans of these or does anyone have the originals they can scan?
It's one of the absolute rarest (released) PC-Engine accessories I think... a copy sold for only $15 last December, lol. Here's a picture of the back:
This guy seems to sell HuCard trays that go into standard jewel cases. http://www.seymoronion.com/Custom_Game_Cases/TG16_Chip.html
Cool, thanks for that! Except I think I told you the wrong game, sorry about that! It looks like I actually have SUPER Momotarou, since the image you posted doesn't match the label on the card, while this one does: Does anyone know where to find a scan of this game's cover? Or does anyone have an original copy they can scan?