Got a SNES cartridge of Dragon Quest VI that looks almost brand new and it doesn't look like bootleg. Even the screws have minimal rust in them. And it was cheaper than buying from the internet too (no shipping fees to bloat the price). Only downside is not having the box.
Now I'm testing it, and it still plays great, seemingly without any obvious issues.
Enjoy. It's one of my favorite games in the series, and the SFC version is actually better balanced than the remake. (Well, assuming you don't recruit a High djinks (Lamp Demon), but that's *very* unlikely to happen by accident, and can't happen until post- game.)
(Also, note that the game is in Japanese; if your cartridge is in some other language, it's a bootleg.)
(This reminds me: I still need to attempt Romaning SaGa 2 SFC in Japanese.)