Originally Posted by
Tanooki
Bandai I believe was also the first licensed publisher of games that had their product put out in their own packaging/boxes. Before that point anyone who had a game out, it was put into a black box like IREM's Kung Fu. Since this was a baby of a market on the recovery at that point games such as those would have been printed as a test or sorts in small batches. Gamemaster Howard over at NintendoAge stated that Nintendo would do orders in totals of 10K or higher, so keeping that in mind, there's probably few of those games in general printed, and when you factor in how many 'normal' individuals would throw out useless store packaging boxes to get the game and manual out, that would make a lower printed box with far fewer non-trashed boxes remaining in peoples hands to trade and sell.
Chubby Cherub was their first, MUSCLE and Ninja Kid came after and those two have more copies printed, but CC there just aren't a huge pile of those around.