damn!!! really bad... feeling sorry for u brother!
don't know about karachi but here in Rwp/Isb, kabli/kabar shop-owners and chor-bazar (sultan ka kho in rwp) shop owners somehow get the information of stolen cars as car-lifter contact them to sale if car is departed
they also might hav info if car is moved to peshawer / quetta....
approach a reasonable person their and ensure him some reward if he recovers ur car... it might help, rest have faith in following verse (summarized not exact);
All Loss and All Gain is from Will of Allah (s.w.t)