Herdsmen are alleged to be arrowheads of criminals activities in some states of the federation.
According to the corporation, Kyari is a quintessential crude oil marketer with prerequisite certification and outfield pedigree in petroleum economics and crude oil and gas trading.
Mr Obasanjo did not attend the two events. He is not the only past leader to have stayed away from the state functions.
Three persons were said to have been arrested in connection with the abduction.
Mr Buhari on Wednesday renewed the appointment of Ahmed Idris, the Accountant General of the Federation (AGF).
The number two citizen said the extreme poverty of Nigerians who voted him and his principal, President Muhammadu Buhari, into office has made him unable to rest at night.
In the North-West, the district head of Mr Buhari's hometown was also abducted and yet to regain freedom.
The abductors are yet to make their intentions known as at press time.
There have been calls by some state governors for the establishment of State Police in order to properly secure the lives and properties in their domain.
Mr Buhari, who was re-elected for a second term in office took the oath of office on May 29.