Thats correct since year 2000 PAF does not dispose-off their 4x4 & Sedan vehicles without Lab report. engine & chassis number is always mentioned over that document handed over to buyer.
Any PAF auction vehicle when reverified by excise at time of registration stand null & void if lab report attested copy is not attached with such request.
Same goes with Custom impound auction vehicles.
It is bit different with Balochistan & Sindh Customs.