First appearance of Rocky.
"Yegg" is a slang term for a criminal, especially a safecracker or burglar.
Rocky runs an outfit called Crime, Inc. In the establishing scene, he's shown in a posture usually taken by gum shoe private eyes of the era: with feet up on the desk, a cigarette, and a newspaper.
The ranch name is a pun on the popular book and film, "The Egg and I."
The notion of a golden egg dates back to Aesop's Fables.