Have you checked both compartments at the side of rear cargo area? Or under the deck flap. I have a 3rd row, so I've got minimal storage in there...but maybe something is rolling around? My lock nut key was originally back there and I'd hear it roll left/right when turning.
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2014 BMW X5 xDrive 35d M Sport Mineral White
2011 BMW 135i M Sport Space Grey
2007 Suzuki GSX-R 750
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