Respray... it's been written off and put back on the road! :evil:
In all seriousness there are very few cars these days on the road that haven't had a blow over at on a small area, my car certainly has. But it's not usually anything to worry about... parking too close to a rough hedge... leaning against a panel with studs on your jeans... so many honest mistakes and lets face it if most of us did something silly like this then we'd have it blown over so our cars looked mint again. And even top dollar body shops don't always pay attention to hidden edges like arches.
It is also a very common practice for dealers to have something blown in when a car hasn't even been registered yet, due to stone chips from being on the back of a transporter. I noticed one on my fathers Mazda a week or so back and he bought it new. I also bought an Ibiza Cupra new back in 2001 and one day when I decided to detail it properly clay it all back and get it shining like glass, I noticed one of the skirts had been blown in. Personally if the car's been HPI cleared and everything is straight on it I wouldn't worry.
Also I'd like to point out that BMW paint isn't always the best finish, I've seen a dust spec or 2 in a few brand new BMWs. The paint lasts for years but the finish has been known to get past quality control in the factory a few times over the years.