Azizul Haque, an Awami League leader in Chittagong, filed the complaint at the Bakalia Police Station on Friday night, OC Abul Mansur said.
Azizul said Sabbir left home on Feb 21 but did not come back.
After police had released the photos of the nine dead ‘militants’, he suspected one of them to be his son.
He later saw the bodies in Dhaka and confirmed that his son’s was not among them.
Police also identified the person in the photo as Zobayer Hossain after matching fingerprints preserved in National ID database
Azizul earlier said he had not filed a report with police as he was ‘angry’ with his son.
“Our whole family is involved with the Awami League.... It’s a shame that a member of our family has been involved in such things,” he had told bdnews24.com.
Sabbir, the eldest of three siblings, cleared his school-leaving exams in 2010 and higher secondary exams in 2012.
He then enrolled at the International Islamic University to study economics and banking.