Lets be honest, you don't. And even if you did, such behaviour would often not yield anything useful. I mean, this scenario as case in point, it's not primarily a motoring forum, sure Kindai might be a member of other forums, including Lambo ones, but might not frequent them as much, or be as open about things like this elsewhere. There's no (easy) way to ascertain if a vehicle (or indeed owner) has a Section 59 issued to them so quite why anyone thinks it's of such consequence as to devalue the car is moronic. Plus, cars like this can change hands across hundreds of miles, with new owners not giving one care as to the previous owners actions (if purchased from a reputable dealer/trader for example).