GTSnake said: "Shouldn't the VIN show up on Carfax?"
It is my understanding that not all repair shops report this info to Carfax.
It would be interesting to know the numbers of insurance companies that do report.
As has been pointed out in the past, Carfax is a tool...but not always the final answer.
REMEMBER this post by SERPENT INDIANA in April, 2003:
".......About a year ago I ran CARFAX on a bunch of cars I had owned thru the years....there were errors on about a third of them....some didn't show accidents the cars were in....some didn't show proper title info...in short, I was amazed at how many errors there were in these cars...I knew the real story because the cars had been mine....I was mainly just trying to see where the cars were after many years, out of curiousity.....I wouldn't depend on CARFAX as the final word on any purchase....."