Welcome to the GENERAL category at Just Answer. Can you tell us more about your question? Who is Richard Rader? Do you think he lives in Nigeria?
I will opt out since I have no idea who he is, why he sent flowers, where he is from, etc. If you don't know him, enjoy the flowers and make no reply to him. Honorable men who don't know a woman would never send her flowers. You can be sure there is something suspect about the whole thing.