I was randomly surfing around the Pirated Game Museum wiki and happened to notice this cartridge for "Ninja Cat" (a.k.a. Kyattou Ninden Teyandee):
http://piratedgamemuseum.wikia.com/wiki/File:Ninjac.pngAside from the fact that bootleggers who made this cartridge couldn't tell a cat from a fox to save their lives, I noticed something else vaguely interesting: the sidebar reads "LEE02014 - NILEEA CAT".
At first, I thought, "wow, that's an even worse spelling of 'ninja' than is usual for bootleggers", but then I realized what must have happened. ni
NJa --> ni
LEEa. Which suggests that this cartridge probably had the ID NJ02014 at one point, and that this line of cartridges is probably connected, directly or indirectly, to Shenzhen Nanjing.
(Interestingly,
this alternate version of the cart also has a LEE id, but spells "ninja" correctly.)