Sport suspension

[Jeannot]

How is it possible to find out if a 2002 Boxster S has a sport suspension or not
I bought mine from the local Porsche dealer. They claim mine it has the sport suspension, but it is not listed on the option list as it was retrofitted by the garage itself. They claim that their accounting department can provide the invoice for the work, but 1) I understand they are lazy to dig in their files and 2) I'd prefer to SEE it on my car itself

Thanks...