The most likely reason they kept those letters was that they intended to use them as bargaining chips to secure their own escape should the interception ever be discovered. It would also provide them with a shred of room to maneuver. After all, given how blindly loyal Shazhu was to Yi Zhonghai, First Aunt only needed to offer a small explanation. If she claimed they had intercepted the letters out of fear that Shazhu and He Yushui would be haunted by painful memories, Shazhu would surely believe it.
As for the money inside the letters, that would be even easier to explain away. They could simply claim they were holding it in safekeeping for whenever Shazhu got married or to serve as a dowry for He Yushui.
At that moment, inside the interrogation room at the Police Station, the atmosphere was exceptionally heavy. He Dong looked at Cuilan before him with a blank expression, skipping any unnecessary preamble.
Chapter 224