The rear floor mat arrived. The first one they sent was like the one from the E53 - raised edges, very resistant to spills but not the most elegant.
This one is reversible - non slip rubber on one side and carpet on the other. It is folded double so that when the rear seats are folded down, it can be unfolded and will cover the entire floor. There is even a flap the covers the lower portion of the tailgate.
The instructions that come with it are awful - unless you read German.