hello, i had a similar experience a few years ago,
when i tried to sell my car on ebay,
i received an email from someone funnily enough they where also from 'Nigeria' claiming to be a vicar and it is just what he was looking for to drive around his parish, he seemed genuine enough, until he asked me to find out about shipping the car and for me to pay all the shipping fees upfront and that he will pay me back when had received the goods, oh yeah and by credit card.
then i thought yeh, yeh whatever......