In that era, ten dollars was a substantial amount of money, so as a reputable midwife, she would naturally keep secrets. Otherwise, no one would dare to hire her for delivery, right?
The Qins reported Qin Xue and her brother's ages as younger when they registered them, making the records harder to decipher; this was one of the problems he faced when he started the investigation.
If he hadn't gone back to organize his thoughts and restart the investigation, he would not have discovered these details. At times, he wondered if someone was assisting the Qins because many things couldn't have been done without help.
However, when he investigated the Qins, it didn't seem like they had such resources. Therefore, until now, he did not know if there was anyone supporting them or was he overthinking things.
After understanding what he needed from the midwife, he waited until the new mother's side reported that both the mother and baby were safe, then he left.