Fantastic job there! You, Sir, are legend. That's a sweet looking little box, very clean lines, love it.
Please may I know what type of paint you used? I have an airbrush and have had some good results with it but have never been confident about spraying onto polystyrene-type plastics as I've always preferred some slight marks to a melted piece of classic portable audio kit.
It was good of the seller to do the honourable thing and here's hoping that he'll have learned from this and will now pack things properly.