I get this garbage all the time, from every source you could imagine. I've gotten them from "The FBI" previously, saying that the Nigerians were legit and it was okay to provide them with all the info so I could get my money, but the one I got from them today, tops all previous ones. They told me if I didn't stop dealing with the phonies, and provide the info they were asking me for within the next 48 hours, that I would be arrested and jailed.
How can even reasonably intelligent people fall for this crap?