Is it the sun's reflection, or did the rear plastic window appear to be a bit hazy on the white boxster? The price seems higher than usual for the car. Here is another local (Campbell) dealer who specializes in used p-cars (no affiliation) :
http://www.import-connection.com/
They seem to have two cars that meet your criteria:
1. 2001 Porsche Boxster S ($26.5)
Loaded silver on black, Sport touring package, PSM, Digital Hi-Fi sound with CD changer, Xenon headlight package, 18" Turbolook wheels, O/B Computer, Aluminum instrument, Cruise, Keyless entry, Alarm, One owner, Local Ca car, New clutch, New brakes, New tires, 60k service done, Excellent condition. 47k miles.
2. 2002 Porsche Boxster S
Nice arctic silver on black with black top, Sport package, PSM (Porsche Stability Management), Hi-Fi Sound with CD player, 18" Turbolook wheels, Aluminum instrument, Air deflector, Keyless entry, Alarm, Books, Lease return, Ca car, Clean title, Non smoker, Excellent condition. 45k miles.