Before I start talking about this one, hi there! I'm recorderdude and it's a pleasure to join AtariAge.
The reason I got on here has been because of a recent acquisition of mine. I've been collecting Atari for a little under a year now, and prototypes for a little under 2 years. I tend to only go for the stuff that slips below the radar, because I figure high-dollar prototype listings are gonna go to a collector no matter what, but when people who don't know they have a proto sell them, there's a good chance someone else who doesn't know what a proto is will buy them, and it might get lost to time.
I've found two protos before this one, one of "Berlin Wall" for the Game Gear for $30 with a junk GG: http://www.smspower.org/forums/15084-BerlinWallPossibleDevelopmentCopyFoundUSReleaseConsiderationTies
and an "Incredible Hulk" proto for the Genesis for $11 with an amusing story of its own: http://www.sega-16.com/forum/showthread.php?30328-SEGA-Genesis-Hulk-Prototype-Found
Both seem to be final or near-final ROM.
I purchased this game in a lot of 2600 games - mostly doubles, but with a few other good games I didn't have like Jawbreaker and DK Jr. The seller stated this one may have been from a trade show his father went to.
This proto also seems to be final or near-final ROM (though I'm certainly no expert on the subject, and only played it for a few minutes to check for anything obvious), but this one has something distinctly interesting about it: a completely different game name! "Cops 'N' Robbers" - I don't know why it was changed later, maybe they were worried they might infringe on Atari's tagline for "Maze Craze"?
I have reason to believe it is indeed a proto as the cart top label is similar in type to the one on my Berlin Wall proto, and I literally cannot find ANYTHING when I search "Cops N Robbers Atari 2600" besides Maze Craze info.
Warning: big images incoming!
here's a video of the game playing. I had my difficulty switches on expert, but Bank Heist behaves the same way.
If the people here feel there's reason to dump the ROM, I'd be happy to see it preserved, but I don't have a dumper, so while I won't ask for some kinda huge sum of cash, I'd at least like some help getting it dumped (either borrowing a dumper or sending it to somebody reputable) if there's interest. At the very least, the name difference can be noted with just pictures, as like most atari games, it doesn't appear in the actual game.
Thanks for checking out my topic! Here's to these odd relics of the past being preserved!