Nigerians are scammers. Don't do business with them. A professional colleague of mine who is part of the Lutheran Church went to Nigeria. Nigerian pastors told him to hide all of his important belongings when going to church because "your people there will steal from you."
A Nigerian client here still owes me money. But his case is over already and he has disappeared. Another former Nigerian co-worker asked for $5.00 from me for lunch to be repaid after his next pay check. He just ignored me after lunch and has never paid me back.
Things of the sort. That country is full of scammers. Don't believe any of them, not even the judicial authorities. They are corrupted. They can be bribed and they will do harmful illegal activities. Always. And they can sound very nice and convincing in some subtly nice way just to persuade you.
I used to worry about South Africa because of apartheid. I actually donated $10.00 back in college for South Africa. But lately I've learned that those African countries abuse their funds all over. Millions are lost and channeled to their leaders' bank accounts without being used for the good of the countries.