The truth the matter is Pakistan did not like any finger pointing by India, and because of that grudge they wanted to hide Kasab's identity as much as possible. How can a country not have any account of a citizen especially if he has lived there for last 20 years. There are physically address, schools he went to, previous jobs he had, and tax returns if it is possible, and even close family members and associates. It was erased from the database instantly, and a grand statement was made, we have no records of this man. If you call this cooperation then granted.