Wang Changfu had been keeping an eye on Liu er while he was committing the crime, so he didn't know that Wang Zhangshi was dead.
Only when Liu er came out and he didn't see Wang Zhangshi did he know what was going on.
This was also the reason why he had decided to kill Liu Da and Liu er.
Wang Changfu and Wang Zhangshi's child had been taken care of by an old woman Wang Changfu had bought in the city. Wang Changfu had taken the Wang family's Silver notes, but he hadn't taken them all at once, so the Yamen had thought that the Wang family hadn't suffered any losses.
Other than the Wang family, no one else knew how much money they had saved up. The money Wang Changfu had left behind matched the amount of savings a Wang family villager had, so the Yamen didn't suspect anything.