Some have also had to fight on the frontline alongside the rebels.
It was still not clear if any of the 219 girls snatched in April 2014 from their school in the northeastern town of Chibok were among the freed hostages.
Rights activists on Saturday praised the military successes, but expressed hope that the missing schoolgirls would soon be found.
“Anybody that needs to be rescued should be rescued. We must never come to this sorry state again,” Joe Okei-Odumakin of the Campaign for Democracy told AFP.
“With the way the military operations are going, I am hopeful that we going to get the Chibok girls out,” she said.
“The Chibok girls remain the rallying point for the struggle. We understand over 2,000 have been taken by Boko Haram. We should work collectivity to liberate all of them,” she added.
Odumakin urged prompt medical attention for those freed. “They should be given proper medical attention, united with their families and be assisted to live normal life.”
Public commentator Tony Uranta commended the troops for their string of successful operations, adding that the recent provision of equipment and weapons likely played a part.
“It is not that the military were not willing to fight. But you cannot fight terrorists with bare hands. Why it is happening now is because they can lay their hands on equipment,” he said.
“The fact that the military have rescued more than 500 people in just one week means they can do more if given the necessary encouragement and equipment,” he said.
Uranta also said concerted effort should be made to free the remaining hostages.
“It is not just the Chibok girls. All hostages still with Boko Haram should be rescued,” he said.
The mass kidnapping in Chibok prompted global outrage and forced President Goodluck Jonathan to accept international help in the search operation for the missing girls.
The outgoing president has come under severe criticism for not doing enough to free the Chibok girls as well as end the Boko Haram insurgency that has claimed at least 15,000 lives and forced some 1.5 million people to flee their homes since 2009.
Jonathan hands over power on May 29 to Muhammadu Buhari, who defeated the outgoing president in a historic election in March after campaigning against his record on security.