Mansour was coming to Quetta from Taftan, Balochistan, when his car came under the drone attack, killing him and his driver.
A passport and a computerised national identity card found near the burnt car bore the name of Muhammad Wali. It is suspected that Mansour carried fake travel papers, Dawn News reported.
While Pakistan has not officially stated that the person killed in the drone strike was Mansour, US President Barack Obama has confirmed that the man killed was the Taliban supremo, believed to be in his early 50s.
"'Wali' had a Pakistani passport and was travelling on it with a valid visa of Iran and Dubai," the official said, adding that the passport was twice issued to him from the Quetta passport office -- first in 2006 and then in October 2011, after the previous one had expired.
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The national identity card, too, was issued to 'Wali' from Quetta in 2002 and after completion of its 10 years' validity it was renewed from Karachi.
The official claimed that 'Wali' was a frequent flyer and 70 per cent of his travel originated from Karachi airport while once he flew from Quetta airport.
"He visited Dubai 18 times using Karachi airport on valid
visas and once from Quetta airport," another senior government official was quoted as saying. "We have no idea what the purpose of his frequent visits to Dubai was," the official said.
"He first went to Iran on February 19, 2016, and returned to Pakistan through the Taftan border town on March 10, 2016," the official said, adding that he again travelled to Iran on April 25 this year and returned to Pakistan through the same route on May 21.
The man believed to be Mansour hired a car at Taftan to travel up to Quetta. He had lunch at Padak near the Dalbandin area of Chagai district before resuming the journey. However, before reaching Quetta his car came under the drone attack, the report said citing sources.
'Wali' travelled atleast ten times on a Pakistani passport issued from Karachi made nine trips to Dubai and to Bahrain.
"He flew out from the Karachi international airport 10 times," the report said.
The report said that investigations had confirmed that 'Wali' had purchased apartments in Bismillah Terrace near Sohrab Goth on the outskirts of Karachi where he resided with his first wife, Shahina who bore him 11 children.
Reports said that the intelligence agencies had yesterday taken Wali's first wife and children into custody after they vanished from Bismillah terrace and hid in an Afghan colony.