I know of 3 specific vehicles that I had ran CARFAX on and it didn't even show all of the info. 2 of those are vehicles with salvage titles (my old 200SX and a 240 I am looking at buying) and it said both titles were clean. It even showed the 240 as a 1 owner when I saw the paperwork from the original owner and the second owner where they registered it. I think when buying a used car you should just give it a very in depth looking over in person. I personally wouldn't buy a car over the internet or sight unseen.