Some non-nefarious people use photoshop to quickly brighten up their images. There are tools that instantly turn off-white areas into snow white areas. Not a fan of it, but it is a reality. If you are worried about it being a legitimate card, ask the seller to take and send you a couple of quick, unretouched cell phone pics in 'normal' lighting of the front and back. If the same issues are prevalent, then you'll have a decision to make.
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