As of now, there are no such expired codes in the game yet. So, consider redeeming the current ones right away to get their rewards. The best place to find newly released codes is the PAINT or DIE ...
The Second Floor of the library in Clean the Library only has 6 sections: 2A, 2B, 2C, 2D, 2E, and 2F. See the table below to learn which category (and books) go in which section.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results