Actually I have seen quite a number of non-faded copies in Japan recently. Keep in mind in 1996, the Saturn & PlayStation dominated + SNK wanted to kill off the cart system by pushing the Neo CD with its much cheaper software, all of which capacitated carts to sit on shelves and get faded by the strong fluorescent light in Japanese game stores.
It also depends on the colour of the spine, as yellow & green are the #1 and #2 colours to go, which we also often see in the faded NG logos.
Non-faded copies are not as rare as they used to be if you ask me. Tomorrow I might even toss mine on eBay just for the fun of it.