I've seen one or two of these before. I believe this is a repair job, albeit a very strange-looking one. I would say it is a legit cartridge.
acg12xu, you would do well to ask what you can expect from someone as far as making things right, instead of "what recourse can be taken." Most people wouldn't open up a Burning Fight to see if it is a boot, as there is not enough market for it to warrant bootlegging, and no one has ever seen a bootleg Burning Fight to my knowledge. If, theoretically, it had been a boot, I would not expect the seller to have suspected that, and I'm sure he would have refunded your money.