Jimmy got the information, and Chuck left; most of the things they've done these days are illegal, so it's not certain what can actually be used and filed later. Therefore, the documents can't be brought back to the police station; they are left with Jimmy directly.
Chuck believes that although Jimmy hasn't said anything, he definitely knows what to do. These pieces of evidence will surely be left appropriately in the end; they will return to the police station's archive as evidence and report content to conclude the case.
Besides the people from the Poison Snake Gang that Chuck investigated, the information also included the murder case Nia was previously investigating. This car accident was obviously aimed at the person tracking them, not realizing that Nia and the others were police, so the murder case is the cause, and naturally, all clues found need to be linked.
