The "Jade Cauldron", although not very favored by Li Changzhou and his two companions, is an S-tier artifact.
The reason it doesn't shine now is entirely due to the lack of materials and elixir recipes, as well as a lack of time to research it—Yang Qinglan would only take it out to play with it when she had some free time from training.
"By the way," Li Changzhou remembered there was another item to sell, "Officer Zheng, do you guys like mecha?"
"Mecha?"
This was real technology, complete with a whole system, highly valued by the nation, with three people arriving whose ranks were obviously very high.
Luckily, the nation had an item called "CD Disc" that could imprint memories and knowledge, otherwise, Li Changzhou would have to write it all down himself.
After the technicians confirmed there were no issues, a high-ranking military officer asked Li Changzhou directly, "What do you need?"