President Buhari rejects a truck load of ram

President Muhammadu Buhari has reportedly rejected a truck-load of ram presented to as Sallah gift by a prominent elder statesman in Katsina state.
Report said Buhari, who hails from Katsina, ordered that the trailer be returned to the sender with immediate effect.
WashingtonPost had described Buhari as Africa's least corrupt leader.

Unconfirmed reports said the president rejected the gift because he does not want to feel indebted to anybody, to further reinforce his inauguration  statement that 'he belongs to everybody and to nobody'.
So what do you think.. Is he really corrupt?