do you happen to have any proof of ownership ? as in xerox copy of papers ? any document pertaining to purchase of vehicle ?
if there exist any such paper you have to locate the person whose name is on the registration book, request him to lodge an FIR for the lost papers, with some speed money paid to agent at excise office the papers can be obtained by the person who is owner of vehicle in excise records.
once the papers are issued, immediately file for transfer of vehicle to your name. complete the transfer. - am sure that person will EXPECT reimbursement of his time and favor by all means., in cash or kind.
and remember NEVER again to keep a car on open letter .......for sake of damn resale value ....
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if you do not have copy of any document keep using the car till it fall apart, mean while, pray that you don't get stopped at random snap check by police / rangers / customs else consider yourself criminal as per law of Pakistan, car will goto impound till production of ownership papers.
Warna .. Mohammed Ali Jinnah saheb will be only way out for you for every trouble you meet in this car