Just how I purchased my 2000 Boxster S with 33,000 miles on it.
Took it to Hergsheimer Motorsports (Lake Forest, CA) for a complete check up (Thier Used Porsche Pre-Purchase Inspection). turned out the 30,000 mile service wasn't completed ($1000) and one CV boot was torn and needed to be changed. They checked the compression and under the car to look for salt damage for $180.
Went back to the dealership as this should have been done already and they took $1,000 off the price of the boxster.
Ended up spending $360 total to have them check out the 2 boxsters (ALMOST IDENTICAL in options and mileage/year) turns out one had the rear trans seal replaced and was still leaking.
Small investment to be sure your picking the most trouble free used Porsche.
I paid $26,900 for my 2000 Boxster S with 33.000 miles on it

what a steal in February. I watched it sit on the dealer lot from December and it rained everyweekend in Cali so nobody really saw it, they could n't sell it in 2.5 months so i bought it to "take it off thier hands".