Because you get white eggs from white chickens and brown eggs from brown chickens (*), this one came from a brown chicken with the digital option:
The egg matched the carton date stamp, so this must be an additional part of the process.
Some casual searching shows egg shell printing is a production-line thing.
I suppose RFID-per-egg will eventually be the Next New Thing.
(*) Yes, and chocolate milk from brown cows. Work with me on this, OK?