When I've sold GBA games on eBay, I never sell the box or manual so I guess I just naively assume that you can trust people. I found a seller selling PAL versions of games and so I bought four of them. But as soon as I opened the package in the mail, I was like, these have to be fake. So I called Nintendo customer support to confirm that these details prove that the games are not legitimate copies. I have unscrewed and opened up all the cartridges to see the inner layouts and they are all similar to counterfeits listed in this guide:
http://reviews.ebay.co.uk/Fake-Pokemon-Gameboy-Games-GBA-Avoid-Counterfeit-Game_W0QQugidZ10000000003210454 The items are listed at PAL versions, but one game even says it is a US version when loaded on a GBA.
(inside a real copy)
(Fake)
Kirby: Nightmare in Dreamland: Nintendo seal of approval is not metallic and is missing the pointed bursts around the edges, the cartridge has the wrong texture, no serial number printed on the front of the game, no embossed number printed on the front of the game, 'Nintendo' not printed on the internal board, internal layout is different from the same official GBA game, cartridge art from US-purchased game is different, auction said PAL version but game shows US version, the game loaded a screen of a monkey with a banana that is not featured in the official US version before the title screen
Kirby: The Amazing Mirror: Nintendo seal of approval is not metallic, ESRB rating is has see-through text, the cartridge has the wrong texture, no serial number printed on the front of the game, no embossed number printed on the front of the game, 'Nintendo' not printed on the internal board, internal layout is different from other official GBA games
Breath of Fire: Nintendo seal of approval is not metallic, ESRB rating is has see-through text, the cartridge has the wrong texture, no serial number printed on the front of the game, no embossed number printed on the front of the game, 'Nintendo' not printed on the internal board, internal layout is different from other official GBA games
Breath of Fire 2: Nintendo seal of approval is not metallic and is missing the pointed bursts around the edges, the cartridge has the wrong texture, no serial number printed on the front of the game, no embossed number printed on the front of the game, 'Nintendo' not printed on the internal board, internal layout is different from other official GBA games
I've filed disputes to PayPal and eBay already.
Lame. It bugs me when people are dishonest.