Something to note about 419 emails, is that they will often have a different “reply to” address than the one they were sent from.  There’s two reasons for this.  One is that, if the email address being used to send the scam is reported, the one the people reply to will still be open.  Two is that there are programs out there that will allow a person to put anything they want into the field that shows the sender’s email address.  That email you received from the CID, FBI, Interpol or even the President himself with an official email address is much more likely to have been sent from an internet cafe in Lagos using a free website script.