EG became RG on the box Lois is holding
The changing of the letter E to R...
Klar, you beat Beppo by two minutes - but unfortunately you were only half right! Lois isn't holding the case, the guy in the middle is.
Although page three of Jerry Siegel's script describes the case as having the initials "EG" on it, later in the script it's described as having the initials "RG." Plus it's also described in dialogue and drawn as "RG" on Joe Shuster's finished, inked, and lettered page 13; so to be consistent we had to make it "RG" back here on page 3.
I'm assuming Jerry's "EG" was a typo - E and R are right next to each other on the keyboard.