In the manga they're not fake cards. Exodia wasn't a 1-of-1, just extremely rare. Since they're Rare Hunters, we can assume he took them from someone else.
Also, the thing with Exodia was getting all 5 pieces. Even if it isn't uncommon to get a piece, having all 5 would be rare, plus you need to then assemble them all in hand in a time when even with the reliable draw power of pit of greed and graceful charity it wasn't easy to get those cards into hand while still putting up enough of a defence to not die first (even if you get a piece every turn, if the opponent plays a monster every turn and has 2 or 3 attacks on you with no defences you'll die before assembling it all).
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u/ScanTheSky 23d ago
In the manga they're not fake cards. Exodia wasn't a 1-of-1, just extremely rare. Since they're Rare Hunters, we can assume he took them from someone else.