It was indeed one of the secret letters Qiu Pusheng had written to Fan Jianxi.
There was also Qiu Pusheng's private seal on it, which was irrefutable evidence that it was from him.
When Fan Jianxi wrote to Butler Fan and asked him to report it to the higher-ups, the long letter mentioned that the things that Qiu Pusheng had written to him had been taken away. The note said that it had all the evidence from the secret room. Now that there was a letter with irrefutable evidence, Shi Che had to believe that those things were taken by the person who had shot the arrow.
He even specifically mentioned people who had brought more letters…
It seemed that those things were really in the porridge stall in front of the government office.
Shi Che hurriedly brought along a few of his most loyal followers. They left the government office and went to the porridge stall in front of the government office to check if the letter's contents were true.