CPS2 boots only require eproms with the proper code on them. Only multicart CPS2 games require anything fancy to work.
If you open the CPS2 game and the chips are missing the capcom sticker that's a giveaway.
Ask on AO
Plastic case doesn't determine it as a non boot. Progear boots are easy to point out as they'll be full of eeproms and have no CPS3 SIMMS in.
Its pretty easy once you've seen a few, and to be honest, it hardly happens except with progear. Just buy the games you like and enjoy them.
Yeah, a blue progear is pointless anyway.
I've seen a few CPS2 conversions posing as legit copies coming from Hong Kong that have a daughter board soldered across several sockets in place of the program roms. These are either a conversion from one game into a rarer one with a fake label slapped on the case. The label usually doesn't pass close inspection, but I would imagine it could. In some cases they actually convert a game to the same game with this daughter board method. These conversions are always the phoenix version of the game since they can sell it for more.
Its easy to spot one but firstly you have to decide what you class as a bootleg. For me that can be a legit CPS2 'b' board that has had the game changed and uses a phoenix edition type fix to work. I want to point out that there are buchered phoenix edition versions out there that do not have the splash screen so its harder to spot. Easy signs to look for is manual soldering around the PALs, and non standard mask ROMs for gfx and sound.
You cannot really look at the soldering of the jumpers as a clue as those are done manually when Capcom change games.
If you open the CPS2 game and the chips are missing the capcom sticker that's a giveaway.
Some original B-boards doesn't have the official Capcom stickers on the EPROMS:
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Handwritten labels are also common on some original B-boards:
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Some B-boards were oficially converted/relabeled but kept the sticker of the previous game intact on the plastic case.
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In this case i found a D&D2 and a X-men sticker under the Marvel vs Capcom sticker.