A brightly-painted chicken egg, hard boiled. It is nothing but a novelty item and has no actual use. According to Chris Avellone, then at Black Isle Studios, the Easter egg was however supposed to hatch a recruitable non-player character named "The Chicken."
In the New Reno Arms basement. The Easter egg is in a pot hidden amongst a pile of crates, near the bottom left corner of the room.
↑Aaron Johnson: What does the Easter egg you find in New Reno do? Chris Avellone: Nothing, it's just lame game developer humor - it was just there so we could say for sure there was an easter egg in the game. I like the icon for it, though. (Fallout Bible 5).