What does Cao Cao mean by giving Yu Xun an empty lunch box?

There are different opinions in history, mainly two points.

1, Cao Cao sent an empty lunch box to tell Yu Xun that I have no food for you here.

2. Tell Yu Xun that the big fellow you are loyal to has no salary for you. It is better to abandon the darkness and come to the public as soon as possible.

Both Chen Shou's "The Three Kingdoms" and Luo Guanzhong's "The Romance of the Three Kingdoms" say that one night Cao Cao gave Yu Xun a box, and Yu Xun began to be happy, but when he opened it, he found it was empty. He immediately said with tears in his eyes, "Today's Yu Xun has no Hanlu to eat", and then committed suicide by taking poison.

Extended data:

Yu Xun strategically designed a blueprint and operational policy for Cao Cao to seek the north, including "ruling the world by taking root" and "welcoming the son of heaven". It can be said that without Yu Xun, Cao Cao may not have the opportunity to "support the emperor and make ministers."

Tactically, in the face of Lu Bu's rebellion, Yanzhou was saved, Yuan Shao was destroyed in Guandu and Jingzhou was attacked by surprise. Politically, he recommended and selected a large number of talents for Cao Cao, such as Zhong You, Xun You, Chen Qun, Du Fu and dramatist Guo Jia. It can be said that if Yu Xun didn't have Cao Cao, he might have succeeded, but if Cao Cao didn't have Yu Xun, it is estimated that this land in Hebei would be difficult to sit still.