Thanks Steve0x. I figured out the problem, and it's a bit embarrassing. There was a small stone seated in the recess below and behind the nut. This wouldn't allow the box wrench opening to fully capture the nut. I'm all set now that the stone has been removed. That's what happens when you get older, can't see as well as you once did and don't use sufficient lighting.
Joe
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2002 Boxster 2.7 Lapis Blue
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