Base Number Five did not hold any celebratory events for Ji Xinghe's return because of their scarcity of resources.
Before Base Number Three was captured by the Empire, its production and transportation of accompanying resources were already disrupted due to the ongoing war. After Base Number Three got captured, nearly fifty thousand people were relocated, adding to the resource pressure of other bases.
The troops originally engaged in the outskirts of Base Number Three can no longer receive corresponding resources and must now rely on other bases for support.
Time is also a constraint. The Empire's continuous full-scale invasion has drastically increased the rate of weapon damage and consumption. Ji Xinghe isn't very familiar with other departments, but he clearly knows that the mechanics in the repair area are much busier than before.
Ji Xinghe himself is very busy too.