Few Questions on a car I'm looking at

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2002 Boxster S, 26k miles, Porsche dealership is asking $34900.

What I know:
*Exterior, interior, trunk space are all very clean and in excellent shape.
*On the test drive it seemed mechanically sound and had no extraneous rattles, etc.
*Has 2 sets of keys
*Couldn't find the manual. I'd insist on one.
*Has PSM
*Has heated seats but the only electronic seat control is for tilt
*Plastic window is in fairly good shape
*Has cruise control
*17" wheels
*Tires seem to be at about half life
*6 speed manual
*Color is silver with black interior
*Oh, and it was a blast to drive!

What I don't know:
*Dealer claims that the wheels with Porsche insignia is an upgrade. True?

*Dealer claims that the seats with Porsche insignia on headrest is an upgrade. True?

*Dealer claims it has the high end stereo available for that model. It has a CD player with the slot behind the face plate, speakers in dash and door (none rear), an amp in the front trunk. True?

*I've requested a vehicle history including service and ownership which they said they'd explore.

*How do I evaluate tire life with these tires?

*Being this close to the 30k service, I'd assume it would be smart to have them throw that in the deal. True?

*I was told it isn't being offered as a CPO. Is there a reason it couldn't be? What are Porsches standards for age/miles? How important is it?

Thanks!