Yeah, I'm positive that's an MVS cart you're looking at. The owner probably just didn't have a shockbox so he used an old style AES case instead.
edit: For some reason I swore that case looked more like a regular vinyl when I first looked at it. I'm just being crazy, that's likely just a standard shockbox pictured. That's more than likely not a boot though, AoF3 MVS isn't that hard to come by, I don't see why anyone would waste their time making a boot. It's just a horrid reprinted label, but I'm pretty confident you've got a legit cart there.