Mr Ukoha said that the convict received the amount on different occasions in 2016 on the pretext of helping the victim purchase a property.
Gang Deng, 29, was caught with a truckload of minerals suspected to be lepidolite.
The judge ordered the convict to repay the nominal complainant N18.4 million within six months.
A source said the grilling interview was in respect of a criminal diversion of public funds to the tune of N1.6 billion.
The EFCC says it suspects that the money stashed in a safe at Sigma Apartment in Wuse II, Abuja were proceeds of money laundering.
Ms Taiga is an alleged accomplice in the multiple fraud cases involving Process and Industrial Development Limited (P&ID).
Mr Maina’s son, Faisal, was on Thursday committed to 24 years imprisonment on three-count charge bordering on money laundering.
