Mohammed warned that the South-East should not align itself with the South-West due to the alleged betrayal tendency of the Yoruba.
The Money Laundering (Prohibition) Act 2011 makes it illegal for any individual to accept or make any cash payment that exceeds N5m (Five Million Naira).
The incident is said to have occurred on Wednesday, the day he celebrated his 59 birthday.
Since he asked the last question, the official Twitter handle of the anti-graft commission has refused to respond despite been active and tweeting other activities of the agency.
Mr Keyamo provided further information on the agreement which was signed by both parties.
During his first term, Mrs Buhari was addressed as wife of the president but has since reverted to the title of First Lady since her husband won re-election.
The secessionist group, now proscribed after confronting the military, is demanding an independent state of Biafra Republic.
Recently, a report said political office holders in the country are among top salary earners across the globe.
Although his principal vowed to end medical tourism abroad for government officials while seeking to be president, he has however not succeeded in doing so as at press time.
The premises is usually being used by Nigerians for anti-government protests.