According to a game seller on ebay known as Steve, (IIRC), who owns "VideoGamesSource", these games were found in a warehouse that SNK owned, that sat there for years and years, and SNK never sold them. So all of them were sold in bulk to the owner of Video Games Source, and VGS sold some of them to Telegames and a few other places, then when Telegames went out of business, they sold their remaining stock BACK to VGS, and VGS sold some of them to Shawn in the early 00's.
VGS has been taking these game carts all over the entire world, selling as many copies as they can in many regions, which is why there were censored (Nam1975), when they got to Germany, and then by the time they made their way back to America, they were censored, beat up, and due to such heavy travels from Warehouse to Warehouse, the soft trays were all busted up, and they have been sitting in warehouses that are not air conditioned, and this is why some games now smell of dampness, and have humidity damage to the inserts.
These games have been for sale , from what the owner tells me, since 1996 when he first acquired them all, and he is just now, finally selling the last few remaining copies. It's amazing to me, that SNK made so many that simply never sold. What a huge ass waste of money and time for them. It's sad really.
This all came from the owner of VGS, as I spoke to him on the phone for about 30 minutes one day when purchasing games from him in bulk as well.