As was pointed out in many earlier posts there are 2 kinds of fraudulent licenses. They are either fake as is not actually issued by the regulator, or genuine but issued on the basis of a fraudulent application ( eg having someone else write exams for you, or bribing an examiner to pass you).
There still doesn't seem to be much clarity over which category the "fake" licenses fall in. At the risk of over generalizing, Pakistan does have a reputation of endemic corruption in many public agencies. I wonder what appetite there is to go further than a simple test of whether or not a particular pilot holds a genuine license document, to the far more contentious and difficult test as to whether or not the that document was issued on the basis of a fraudulent application ?