I need help to find some information on a guitar i just bought.?

I bought a guitar at a pawn shop yesterday. The amp came with it, seemed like a good deal. I know my stuff when it comes to guitars, but this has got me stumped. I looked everywhere. The guitar is black with silver lines all over it. It says Grand Prix in gold up at the top. The guy said it was rare and was from the band the Styx. I've looked EVERYWHERE an can't find it.....It has grover tuners, three pickups, and 3 knobs. This has got me stumped. Could I get some help finding where to look?