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I always assumed certain things were simplified for the sake of... well, simplicity. Coins you find in tombs aren't going to be ancient Nordic coins. Just like I don't believe all lockpicks are the exact same shape and size. They're probably just any slim bit of metal your character makes use of.
Look, for the last time: Kirby has explained it over and over! http://i279.photobucket.com/albums/kk138/Schesparn/11911255317531.gif