Like I said before, you didn't just buy a Boxster, you got your self one heck of a support group.
Does the PPI have some type of liability for things he missed? I would check the oil and tranny fluid, belts and other stuff on your own just to make sure!! I don't think there is any evidence of abuse, but maybe a bad tow was the culprit. I would definately hold the dealers balls to the fire to get as much done as you can. The ppi also if you can!! I Mean what the hell did he inspect? your radio?