Assuming you’ll not be able to recover the file, your next steps are to find a guy who can get you a duplicate customs file from karachi customs. I hope you have the pictures of the import file, it will have the name of the custom clearance agent. If not, be ready to cough up anything from 100-200k. Uskay baad 6-12 months ki timeline aur tab bhi youre not 100% sure if you’ll get the file. It also negatively effects your car value by 20-30%.