Otherwise, who would leave such a precious sword behind in a tomb meant to exterminate an entire family line?
As for the dismemberment, there were historical records of it.
The desecration of Li's ancestral tomb was well documented within official records.
Moreover, there was the unearthed copper plaque of Li's "Heavenly Jade Emperor Decree."
It could be confidently deduced that the skull within the tomb was someone Li Zicheng detested deeply.
And the only one who fit the bill was none other than Wang Qiaonian.
It could have been someone else Li Zicheng despised, but Wang Qiaonian was a far more credible candidate than all of his peers.
The defeated general inscribed at the bottom of the box suited Wang Qiaonian, who had been captured alive, aptly.