Hey, now that actually looks like it’s worth something! Just list it on eBay. I’d probably start it at $750, since I’m seeing complete (but not-in-shrink) copies listed for $500ish, with a good deal of interest, and selling for not much less than that.
I’d be prepared to drop it as low as $500 fairly quickly if I wanted it to move.
We’re not talking the Hope Diamond here. It’s a Gameboy game for a few hundo. A very nice amount of cash, but in the ballpark of what you’d have if you’d put the purchase price in an index fund in 1997. Don’t worry, you won’t get “scammed.”
Just make sure you pack it up real nice, in a sturdy box, when it sells, so it doesn’t get damaged in shipping, and insure it for the selling price if you want to be extremely careful.