On my '99 I have two about 1" sq. rubber/plastic spacer blocks, plus a plastic plate the size of a license plate that says "PORSCHE" on it, and two screws to hold all that to the front bumper. If I recall correctly, the blocks have an angled face on the back (bumper) side to match the contour of the bumper.
If all that is missing, then the PO apparently did not have a front plate mounted.
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