The Desk Sergeant had been far from helpful; at best suspicious, at worse hostile. Billy had only said that he was an out of touch undercover operative who needed to see Sergeant Dignum now that Queenen was dead. Billy refused to give his name, saying that as it was known that Costello had friends in the SIU and the FBI, he needed to withhold his name. If Dignum couldn't see him, then he had to talk to the remaining captain in charge - and no one else.
Eventually the morning shift began, and Billy talked to the daytime Desk Sergeant, who told him that Dignum had resigned. Billy demanded to see Ellerby; he took a chance and said that he also had Intel regarding Costello's penetration of the SIU and FBI. Billy didn't like mentioning the FBI, he felt that they were a real danger, an arrogant case of Absolute Power Corrupts in the cause of duty. However, it should gain attention, which it did when eventually Ellerby was contacted.
The interview with Ellerby and a few other cops did not go smoothly. Billy had eaten nothing since noon the day before so he was feeling bad, while Ellerby took an instant dislike to Billy once one of the other cops recognised Billy. Ellerby grabbed Billy and demanded to know what had happened to Queenan. At first Billy was stunned by the brutal hostility. Finally Billy croaked out that Costello had been told were he was meeting Queenen and that if Ellerby wanted to know what he knew about the Mole and the FBI, Ellerby needed to be nice to Billy. Billy wanted his "identity" (whatever that was) back and the money that he had been promised, for over a years work.
Ellerby did not take kindly to "blackmail" so it took a while to "persuade" him to open the Personnel Database, with Billy checking up on what he was entering; that got up everyone's noses but was necessary, else Ellerby would not have entered "trooper" in the rank field. Once the records were open and Ellerby could see that Billy was a cop, his attitude to Billy still did not change. This hid the fact that Ellerby now realised that he had behaved like an ass towards Billy, and that the SIU was even more fucked up than ever. He should never have let Dignum storm out. For his part, Billy refused to say more until he got what he wanted; he didn't trust Ellerby at all now.