I confirm, everywhere I would have gotten it from, it says Whitebrook, so that was just my mistake. (There are other typos I've seen, but that's not one of them.) Either way, though, those terms I tried didn't work.
The second item in the walkthrough did help a little, and I managed to get one more thing, but that didn't really lead to anything else that I can see.
Minor spoiler on what I tried next:
I did notice that the courthouse was mentioned in the town search result, and there's even an explicit hint that I can call it, but no variation of "courthouse" or "Whitebrook Courthouse" that I tried works to make a call, so I am again puzzled by what the game seems to want me to do vs what it will actually let me do.