Never ever do business deals with Nigerians.. I say that and I am Nigerian. The problem is that Nigeria is populated by very educated thieves. Nigerians are also very well traveled so Nigerian con artists and criminals dot the globe.
My family recently experienced this when somebody intercepted a letter from my mother to my aunt. The con artist amended the letter to include a request for several hundred dollars to be delivered to a man who would arrive at an airport shortly, to repay a debt on my mother's behalf. My aunt was instructed to keep the matter secret. The ruse was only caught when my father called my aunt and handed the telephone over to my mother. My aunt immediately mentioned the money and my mother denied having sent her such a letter. My aunt read the letter to her and my mother was shocked to see how her letter had been repurposed.
The moral of the story is that you should never trust communications from Nigeria.