I believe I had what you are describing on my base 2000. When I bought the car it had the OE 17" wheels and I don't remember anything unusual. In 2005 I bought a set of 17" wheels from a 2000 Boxster S and then noticed the front lugs stuck out some when compared to the rears which were more recessed.
I wasn't attempting to show this in these pics taken back in 2005 so they don't do a great job in doing so. But if you use your imagination you may be able to see the difference. The first pic is the rear wheel and the second one is the front wheel.
I bought a new set of 19" wheels in 2007 and sold both sets of seventeens.
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