if someone pulled them in court - the dont stand a chance, the vehicle classification in registration is done by
1 year of manufacture
2 body style
3 chassis no.
4 engine no.
There is no body no. or VIN in Pakistan, they cannot confiscate anything under any sort of law.
The vehicles are body over frame (chassis), and them not putting that in the registration system means that the body is replaceable item. Pakistan customs as corrupt as they are will do anything to make some nice RISHWAT for themselves.