No reason was given for the evacuation of Ibrahim Lamorde, the administrator of the Economic and Financial Crimes Commission (EFCC).
In August, Mr Lamorde denied claims that $5bn (£3.3bn) had disappeared at the commission.
Mr Buhari won Nigeria's presidential decisions in March, promising to battle defilement in the nation.
In August, a Senate council said it was researching charges that advantages and money recuperated by the EFCC had been occupied.
At the time, Mr Lamorde told the BBC the charges were a smear crusade.
He drove the EFCC for a long time until his release on Monday.
President Buhari's representative Garba Shehu said later on Monday that colleague Police Commissioner Ibrahim Mustafa Magu had been delegated as the EFCC acting chief.
President Buhari - the previous armed force general known for his tyrant style - was chosen in March on a stage of tidying up Nigerian governmental issues, the BBC's Martin Patience in Lagos reports.
Over five months after he came to power his new bureau is at last anticipated that would be confirmed in the not so distant future. The explanation behind the uncommon postponement is that President Buhari needs to attempt to guarantee that new priests won't utilize their workplaces for individual pick up, our journalist says.
He includes this has won Mr Buhari broad backing in Nigeria where numerous are sick of the debasement, which they accept is keeping the nation from understanding its full financial potential
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