It's a long story actually, but, to shorten it up as much as possible, someone bought it new from SNK in Dec. 1990 and had it for a little bit and never really used it due to lack of interest from friends and family, so he gave it to his rich gamer friend a bit later to put in his "gaming house". (Cool friend I would have to say). I bought it from that guy, that has had it sitting in his huge game house, (it was his 1.5 Million dollar game room house just filled with arcade cabs, and pinball machines), in Anaheim. The guy had it sitting in this place since 1991, hardly ever touched it, had no clue that it even could play anything other than the games that were installed in it, and was selling his "play house" and everything in it for next to nothing, just to get rid of it now that he has no more time for playing games, (or no more interest in it).
The guy posted this Cab for sale on ebay for $450 local pick up ONLY, and he said he had a few offers, but nobody wanted to pick it up, they wanted him to ship it out. He refused to do so, and said that he would just leave it in the house for the buyer of the house to keep and use if nobody picks it up that day. His auction ended without any bidders, so I offered him $400 for it, and after talking to him on the phone he told me come down immediately and pick it up or it's a no go.
I immediately drove down there that morning after borrowing a truck from a friend, bought it from him, and verified that it was in absolute immaculate condition, (it looks like it was possibly played a handful of times, but no damage or wear to anything), and after I brought it home, I opened it up for the first time in 25 years and found inside that it had contained Kits in NOS condition of Magician Lord, NAM 1975, Ninja Combat, The Super Spy and Sengoku. The games had been inserted into the machine one time and never removed. The kits contained the paperwork, and the mini marquees were in the slots on top of the arcade machine in seemingly new shape, so it was not turned on much or the mini marquees would show signs of wear.
Inside the machine it also contained the manual for the cab, and everything is seemingly perfect. Even the 6 slot motherboard looks to be never even used, and I was shocked about the condition. I have shown it to many of my friends, and people on FB, and everyone considers it "winning a Neo Lottery", which is funny to think about, but, it replaced my single slot cab nicely, and I sold the single slot cab for $600 on Craigs List about 4 days later, and moved the 6 Slot Cab into the spot where the single slot existed.
I was surprised to find the 6 slot is much bigger than expected, and I needed to have someone come down the next day to rip the door jam apart, and widen the door frame by about 4 inches, and I had to install a larger door just to get the cab into the game room. However, the end result was well worth it, and the absolute beauty of this machine had renewed my interest in buying MVS carts in a whole new way. Since then I have decided to buy a complete set of MVS carts all in like new condition to play on the cab, and I have since that time acquired more than half of the MVS collection, and I hope to finish it completely by the end of this year.
Pics of the cab can be found on my FB page, but, I will include a few here for you to check out. True it is not NOS, but, it is about as close to new as your going to find 26 years after it was made, without any slight repairs or any touch ups at all. This is just straight up as it was when it was made in 1990.
http://s1168.photobucket.com/user/SNKNeo-Geo/slideshow/NeoGeo 6 Slot Cab like new