It's not every day that you get an earful of counterfeit identification tips when browsing for a copy of Super Robot Taisen Wars, but it's a great feeling when you do. Astute reader Russ sent us one of his auctions complete with multiple images relating to real and fake GBA games, including a exegesis on each. Quite a nice fellow, that Russ.
They also have a number embossed into the label (see in photo the "09" under the "A", you have to hold it at an angle to the light to see it). Check the seller, if they are in Hong Kong, it is most likely a pirate copy. They also rarely come with manuals, and sometimes come with a FOLDED box(to prevent damage in shipping, yeah right).
Assessing the authenticity of the above cart is left as an exercise for the reader.