This. I once bought an unlicensed NES game (black cartridge) from a dealer for $3. Then I turned around and told him the history of Tengen and about the black cartridges. It was the only black cartridge game he had. 

You should find the bible adventure games. one of them comes in a baby blue cartridge and the other one is a black cart.
My only unlicensed game is Rolling thunder.
Whoever won that game is one lucky son of a [censored]...