Front license plate holder, Avus Silver, (4B3807285G), $50 shipped. Left edge is broken off, but these are discontinued and it's not especially obvious installed with the license plate on. For those who must comply with their state laws and drill into their beautiful Euro bumper.
Owner's manual "leather" cover, $40 shipped. Doesn't feel like real leather, but it has the RS6 stamp and it's original... you can see it's not in the best shape, and the main inner pocket has some stitching coming out (about 1").
Kufatec AUX A2DP Bluetooth Plug and Play Music Receiver for RNS Media (Item #41563), $175 shipped. https://www.kufatec.com/en/car-hifi/...ns-media-41563 Comes with Quadlock adapter and module. RNS-E picture is what it looks like playing a track via iPhone/Bluetooth.