Well, the Bongo finish doesn't look natural. It looks like someone loaded a Bongo pic into Photoshop, selected the finished parts, and did a Hue/Saturation change. Also, the fact that the pics are of the Bongo with no background what so ever is raising questions in my mind.
But I've heard of the Casey Lee Ball Foundation and I'm sure it's legit, but I wish they would've put more effort into establishing credibility with this auction.