1999 Boxster Wheel Lock Key

[A8ked]

The dealer won't be able help.
Easiest thing to do is hammer a 12 point socket on to the lock, which will destroy the lock, but make it removeable. Throw the locks away and just use lug bolts. It's far easier and more likely a thief will steal the whole car rather than just your wheels and tires.
I once spent over a hundred bucks to have a locksmith make me a new wheel lock key. Afterward when mentioning this to the Porsche dealership service manager he suggested the hammered-on socket solution.