Fifty-seven escaped in the immediate aftermath and four years on, 112 are still being held - a global symbol of the Islamist insurgency that has devastated the region.
On Friday night, about 100 people attended a vigil in Nigeria's biggest city, Lagos, under a busy flyover whose pillars are now adorned with brightly painted murals of the missing girls.
"They are only trying to discourage the government", Agim said.
In a series of tweets, detailing the yet-to-be-told story of the Chibok saga, the controversial journalist disclosed that at the moment, only 15 out of the 115 girls kidnapped by the insurgents were still alive.
At least 2,295 teachers have been killed and at least 1,400 schools have been destroyed in northeastern Nigeria over the last nine years, UNICEF said.
Government must demand that to prove me wrong or stop negotiating for numerous girls that don't exists.
Buhari, however, assured parents of the schoolgirls that their daughters would never be forgotten or abandoned.
In April 2016, on the eve of the abduction's second anniversary, it emerges that Boko Haram has sent a "proof of life" video to the government.
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"Let the government do its best to see that every Nigerian citizen in the hands of Boko Haram is released during this year".
One hundred and seven were returned in mid-March. About five died while in Boko Haram hands.
Buhari urged the parents to keep their hopes alive on the return of their daughters, saying the recovery of more than 100 of the girls through the government's determined effort should give confidence. By the 3rd of May, I was already on my way from Abuja to Madagali, Marwa and finally to a Boko Haram camp.
But he added, "We will continue to persist, and the parents should not give up". Don't give up hope of seeing our daughters back home again.
The Boko Haram conflict is in its tenth year, but shows little sign of ending.
In a separate message on the occasion, the United Nations Children's Fund (UNICEF) said yesterday that over 1,000 children have been abducted in the northeast by the terror sect, Boko Haram, since 2013. "Because, Government resist independent reporting of the crisis, most of the reports are choreographed & Nigerians are also not ready to hear the truth or stand by it".
"The time is long overdue for the government to deliver meaningful action on behalf of all the victims of Boko Haram's crimes".
He further challenged the federal government to prove his claims wrong or "stop negotiating for numerous girls that don't exist".
Boko Haram remains a charged issue politically.