I got my Atlantis II a couple years ago, when I guess folks weren't scanning the ebay adds so well (It came with 20 other games for about $25). The guy mentioned in the ad that the auction included "Atlantis II, which was won in a some kind of contest". So I bought it just in case it really was something special (though I figured it wasn't). I just have the cartridge, and it looks just like a regular Atlantis game, except the user had etched a "II" into the label with a pen. I figured it was just his "second copy", that he had labeled accordingly. I would have sold it, but I tried it out and just happened to notice the different score font. I was glad to hear when AtariAge was able to confirm what it was, just wish I had the paperwork that came with it.
Sorry for the length - just happens to be my best "great find" story.