I bought my S3 about 2 years ago off a friend I've known for a long time. He had it since 29k miles (i got it at 58k). My friend never seems to sell cars with any service history which annoys me. I noticed a while back that the Chassis No. on the V5 document was different to the one on the car............ I then did a check on the car and it came up stolen but had been recovered. My friend then had it back for a while when i went away travelling, when i got it back all was fine......noticed yesterday that the chassis number in the bottom corner of the window had been scratched out. This has got me thinking......whats going on?