So far google has no info using (92881000xx Porsche), doesn't help early vin matches both phone numbers and some zip code in Arizona (forcing me to include Porsche as keyword which might exclude some pure vin mention), except for:
9288100028 some discussion on RL related to a found owners manual, not car, but includes early car discussion in general.
9288100034 is Rixter's car
the new old girl on the block - Rennlist Discussion Forums
9288100035 is mentioned without any details, a side reference, as the first AT.
9288100039 is Otto's in Germany, possibly owned by Ferry Porsche, discussion
Number 00039 Prototype ? - Rennlist Discussion Forums
9288100040 side note only in 039 discussion.
9288100051 side note only, once thought prior vin were preproduction.
9288100054 is part number for a fuel line dist. many hits none vin
9288100055 is another part, no vin.
9288100057 side mention in discussion of 9288200057 regards USA vs ROW vin.
9288100068 for sale now in Finland.
9288100100 another part number. last I checked in ROW sequence, 92882 is USA/CAN.
9288200001 Lots of hits as it was published as the start of the vin sequence, which is now known to be 011 with the first 10 reserved for never sold prototypes.
9288200011 no car, lots of hits due to "real" start of vin sequence for USA/CAN.
9288200013 no car, side note in vin discussion regards sales in USA during 1977.
9288200016 Now in Finland, picts of very nice car and discussion
Very early '78 model year US model - Rennlist Discussion Forums
to be cont.