You won't get those out. Sorry to be a killjoy, but if a B&O aluminium cabinet is scratched, you will not remove these unless you get the casing professionally refurbished and re-anodised. Any attempts short of that will look awful.
How do i know? - I've tried it a hundred times a hundred different ways!
It will be much easier for you to simply buy a new casing from B&O if you can't live with the scratch.
Lee
BeoWorld - Everything Bang & Olufsen