I have one of these, mine is 13 years old and has no scrathes or chips to the paintwork at all. I have covered f1 for two seasons travelled the world with it, This lens seems to come from a pro probably motor racing, who has had a 200 a long zoom and a 500mm plus others all hanging round his neck, banging against each other,
Make sure the filter is still in the back filter holder as this will have protected the rear lens.
If you are still interested make them a silly offer 1000 pounds for example and wait for them to come back to you.