In CT all they do is LOOK at the vin. On a old truck like mine i told them its in 1 spot and 1 spot only. Normally i think they look for one on firewall and door or dash and door. Then they issue you a paper just stating that its the “actual vin” and then you go get it registered as normal. ANY vehicle purchased out of state needs to either go through emissions in CT and that “verifies” the vin or if its 25yrs or older then you skip emissions altogether and bring it somewhere that does emissions and pay them like $10 to “verify” it. They are pretty hot rod friendly around here……surprisingly. Vermont is also one of the best spots to register hotrods with vin issues. There are a few on line how-to’s to do the vermont trick. I know a few people that have done it no problems.