Sorry to hear about your parking lot mishap (been there)...
I would send Woody (ItsNotANova) a PM.
You could also try ebay seller QualityPorscheParts.
Here's a link to a white one they have listed from a 99...
99 Boxster RWD Porsche 986 Rear White BUMPER COVER 98650541101 84,779 | eBay
Not sure what the difference is in the white's, but they do have other white ones. Free shipping via freight - it'll come in a HUGE box and takes about a week, maybe less since you are closer than I am to Arizona.
P.S, What kind of bikes do you ride?