I think I may have run into a bug, tell me if I'm wrong. I tried putting the paper into the bucket before solving the code on the computer. The paper disappeared from my inventory but it showed me the "invisible ink" message, the same one you get from cracking the computer code. Subsequently clicking on the bucket says "But what's that at the bottom?" but no longer shows the close-up. Is that how the puzzle is supposed to work, or am I doing something wrong?