Two hours later, Murong Yuanqing called back, telling Li Yifei that the box might be made of沉玉, a highly rare jade that contains a large amount of metal, making it very dense and heavy. However, it's difficult to cut, and he couldn't say how to open the box. Li Yifei then asked if it could be forcefully broken open, by smashing it or using modern cutting equipment. Murong Yuanqing advised against it because the contents inside were unknown, and forceful opening might damage them.
Moreover, if the contents were harmful, releasing them could be disastrous.
Toxic gas? Li Yifei immediately thought of biological warfare, but then dismissed it as unlikely, though not impossible.
"Never mind, let's not let this mess ruin the mood." Li Yifei tossed the box back into the safe and decided to let the matter rest for now.
