My copy of the game guide got here yesterday!
The first thing I did was print the full 6 pages of discovered code cards and stash them in the back.
Despite having just linked a video on this subject, I had to hunt around to find said code list, and it was not on any public-facing webpage. So I contributed them back to the barren wiki page and also hosted them here on the forums: Yu-Gi-Oh! The Duelists of the Roses SECRET Card Code List
This has inspired me to look into the wiki features of Discourse so I can better document the esoterica I get into on here.
Then my copy of the game got here today and hilariously a previous owner had printed out a small set of card codes and stashed in the case. What a cool relic!
Very excited to play this soon. Maybe Monday?