If I remember correctly, Super Mario Galaxy Platinum had a foil card in front of the booklet. I believe that's what is pictured in your link. It looks dark because of the light reflecting off the foil finish. Behind the card was a regular booklet which is what is pictured on VGMdb. I looks like there isn't a scan of the foil card in the database at the moment.
I suppose I should check my copy to make sure I'm remembering correctly. XD
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