G'day!
First off :
http://986forum.com/forums/boxster-general-discussions/14685-thinking-buying-boxster-must-read.html
140km is only about 86k miles, there's several on here with over 250k miles, so for the age that's basically low mileage still! check out
http://986forum.com/forums/boxster-general-discussions/67816-how-many-miles-your-986-987-a.html
It seems the issues most people see regularly are more age and/or lack of upkeep related than pure miles... clutch, suspension, water pump, AOS, various rubber parts etc are all going to be on their way out at 15-20 years if they've not been done already.