Oh, that's right! He spends so much time trying to persuade people to move away from the gold standard.
There's another reason for him to be annoyed: if any watchmen turn up again and see the gold (as seems likely - maybe Colon and Nobby would be just checkin', your honour, don't mind us), then Moist would have a lot of new and unpleasant questions to answer. Possibly from Carrot, or Vimes, or (ultimately) Vetinari.
"And when did you say the gold appeared, sir? Didn't you say there was no gold in the vault at all? That's a very suspicious attitude ..." etc. - that sort of thing.
There's another reason for him to be annoyed: if any watchmen turn up again and see the gold (as seems likely - maybe Colon and Nobby would be just checkin', your honour, don't mind us), then Moist would have a lot of new and unpleasant questions to answer. Possibly from Carrot, or Vimes, or (ultimately) Vetinari.
"And when did you say the gold appeared, sir? Didn't you say there was no gold in the vault at all? That's a very suspicious attitude ..." etc. - that sort of thing.