It's kind of like asking:
"How long is a piece of string"
From the limited info, no, the mileage is not a red flag ~6700/ year is not excessive and in fact may be a good thing, it was not a garage queen. Plenty of Boxsters have gone well over 100k, some 200k or more
If it was serviced regularly, check the mileage on oil changes. The 15K oil change interval as factory specified is far too long. 5K is better
No matter what the records say, you NEED to have an independent PPI done
There are several good independent service places in LA.
Here is a link to some that are listed as for Tech inspections for PCA
All I would expect are good honest shops
http://www.zone8.org/events/tech_stations.php
Asking price?
Options?
Who is selling the car? Dealer ? Enthusiast? private party?