“We want them to accept Islam,” she added, according to local media.

In another video, Boko Haram purported to show the five commanders who were swapped for the girls. The clip issued imminent threats to bomb Abuja. The authenticity of the videos could not be verified.

Last October, Boko Haram released 21 other girls to the government. Officials this week said three more schoolgirls kidnapped in the same abduction had been recovered since then.

Mr. Pogo’s anxieties echo those of the relatives of the first group of released girls. They, too, have complained that the Nigerian government has restricted their access to their daughters and nieces who are living in government custody in Abuja. The issue was amplified over Christmas when the government shuttled the girls to their hometown for a family visit. Parents visited the girls but had expected they would spend the night in their homes and attend church services with them. Instead government officials kept them elsewhere, saying security was an issue.

This week, officials said they could not reunite the newly released girls with their families until they verified the girls’ identities and matched them with their relatives. They were circulating photos to family members, many of whom were scattered across the rural countryside of the northeastern part of Nigeria where both internet service and smartphones are rare. Officials also were organizing transportation for 82 families to Abuja, about a four-hour drive from Chibok.

Officials said they were trying to avoid a scenario that played out in October when some families traveled to Abuja only to learn that their loved ones were not among the group.

The government is now trying to meticulously match families with girls, some of whom use nicknames or share last names with other hostages. During the three years of captivity, many of the girls have gone through adolescence and may appear different than when their parents last saw them.

One lucky relative of the girls, Yakubu Nkeki, has already seen his niece, Maimuna Nkeki, who was among the newly freed girls. As a member of the Abducted Chibok Girls Parents Movement for Rescue, he was allowed to visit the students this week.