How can I tell a legitimate Shantae copy from a fake? [closed]

I recently stumbled across the game Shantae for the Gameboy Color. Looking around for that game, I found several offers on eBay for over $500, and then... several modules for around $7-10 from China.

That seems like a large discrepancy. I mean, these modules must be fake or "unofficial", right? Is there another way to tell whether the cartridge is fake or real?

If yours is real, then it is rare and worth the money. It was released for the GBC when the GBA had already been released.
That's probably why they didn't make very many, and thus why it's rare.

The Chinese listings you are referencing are definitely fakes.
The original cartridge is see-through, not red.

Whenever there's a Chinese seller with a stock photo selling multiple copies of a game, it's most likely selling fake copies. Especially if they're selling games that are supposed to be rare.

A lot of the time people are aware of this though, and just buy them because they like to have physical copies without dishing out exorbitant amounts of cash.