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yep CD prop - that's the best purpose anyone has come up with. The opening width there is just perfect for a CD case, and the two buttons keep the edge up pointing towards you so you can easily pull one out or read it.
I thought they might be pivot points for some sort of door or cover, but this from Capt bj seems more likely. "They also perfectly hold in the little rubber tray you can buy to turn that cubby hole into something useful for things other than CD's."