It does look like a nice car, it also looks like everything is there, except the coolant overflow hose
. Regarding the floor piece, it could be that there was a little rust and someone was being very anal about the repair- I only say that because the seats look re-done and they don't look cheap rears done too! (although I think the pleats are running the wrong way) - not sure-they may have changed that in later cars, anyway if there were "no rust" then it might be worth a look at even at the high price but it would really need a critical PPI at that price since it has new(er) paint. The mirror looks like it came off an early 530i, but again this being the last year I'm not sure. Points come off for the carbs, it would be nice to have FI, but it might be a bargaining point.
Just some thoughts