This is where things get complicated,many owners do not want the S/N published for various reasons.ie: questionable ownership,partnerships,rebodys,and all out fake cars.Some just want their privacy respected and wish to remain anonomous.
We have seen many cars duplicated by the use of remade S/Ns,data plates,SoOs and certicards.It is unbelievable what some will do to authenticate a car for profit.