I believe it is the May issue of 911 & Porsche World, a British Porsche enthusiast publication, has a section on things to look (out) for on a used Boxster.
The article also mentions a new book by Peter Morgan, the name of which escapes me, containing the same information, only more.
Ronzi
'99 Boxster
Speed Yellow/Black
1. Make sure the year on the title says 2000, 2001, 2002, 2003 or 2004, and
2. Make sure the Title reads 3.2L and the logo on the back has an "S" after the name!
__________________
-------------------------------------------------------------------
2006 Lamborghini Gallardo 6spd-Rosso Leto
2006 Range Rover Sport Supercharged-Winter Beater
2006 BMW 750i 19" Sport Wheels BK/BK-Daily
2005 Lotus Elise Sport & Touring Package-Fun
2001 Lexus RX300-Back-up Winter Beater
2001 Mercedes-Benz S500 Sport AMG-Sold
2000 Boxster S Heavily Modified-Sold
2000 Nissan Altima GLE-Parking Spot Holder
-------------------------------------------------------------------