I just installed the Aero kit to my X6 and the original bumper, side sills and part of the back are sitting in a box at the BMW dealership. They will be scrapped or recycled after a short period of time. I figure someone who has gotten into a fender bender recently may have some use for the bumper.
I have NO IDEA what the bumper looks like or what the condition of it is because it came straight off my car and into a sealed box, however, the bumper was in 100% perfect condition when it was taken off (2012 X6 drive bought in June, no accidents). I honestly don't care what you want to give me for it as long as you pay for the shipping and arrange for it to be picked up at BMW San Francisco, since they're just going to trash the parts - but you have to act within the next day or so, otherwise these parts are going away.
Note: I also have no idea what individual parts are with the bumper and aren't. I think all the main parts are intact (fog lamps, etc.). Also, the bumper is painted Alpine White, but I imagine if you got a new bumper you'd have to paint it anyways.