To Jiang Baimian's relief, Oudick couldn't return to the Hunter's Guild because the wilderness nomads were blocking Central Square and attacking North Street. He could only stay in Castellan Manor.
Not only could they return the car this way, but they also had the opportunity to interrogate the fake Father without any need for relays—this wasn't something that could be done with a special permit.
After entering Castellan Manor and seeing Oudick in the side room, Jiang Baimian threw the car key at him and asked frankly, "Has the fake Father awoken?"
Her subtext was: Did you complete the first round of interrogation?