I transferred my car (Khyber'97) on my name(last year), the original charges were approx 3500/- for an ownership change, new passport sized book & a return file, normally it takes 2,3 days, but as I want to go to interior sind urgently, so my requirement to these documents was very critical, I paid 5000 to an agent including charges, he gave all documents to me on the same day, in about 6-8working hours.
Regarding exise file. you must be talking about the return file, this file is an original record file of you car & this file holds a great value itself, there was an incident at CIVIC Centre in past n a lot of files has been destroyed, thats why they are giving these return files "Free of cost" to the owners of the car. but this is Pakistan, nothing is free of cost.
Remember, if a car donot have its return file or its been destroyed in that incident, a new file is made up by the exise people, but I don't know if it depreciates the value of a car.
For your info, there is a person in CIVIC Centre named "Laal", "Ye bunda saanp bun ker betha hai record room mai files k uper, bhot kaam ka bunda hai agar file se related koi kaam hoto, but iss ki muthi garam kerna perti hai, because yehi ap ko bta skta hai k ap ki car ki file hai k nahi?"
vesay to ap phone per bhe confirm ker sktay ho laikin agar CIVIC centre k darshan kabhi kernay per jain to ye bunda kafi help kr sakta hai.
don't know what documents required, the agent told me only sale deed, CNIC, car papers, some type of affidavit thats it, don;t remember exactly