I used Momo's gold bar to make an ingot, called Gold_500. When I clicked on it in-game, it gave me an error, asking if I had made a new kind of gold, and telling me to add it to "TES3Container.epp." Which is not on the HD or CD.
When I clicked "yes" it added 500 drakes to my inventory with the coin sound.
Is this packed in the ESM? Can it be extracted and modified? Or, is this just a developer's troubleshooting message for something that is now hard-coded?