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It looks like you’re referencing a specific internal case or document identifier — possibly from a fictional, gaming, or organizational database (e.g., “Detective Comics” as a department or project name, “MTCDC” as a unit, “NMC 15” as a record class, and “joshua13” as an analyst or agent codename).
However, I don’t have access to any private, classified, or proprietary database under that exact reference. If you’re looking for a based on that naming scheme (e.g., for a roleplaying game, creative writing, or internal exercise), I can produce one for you.
Scott catalog and Scott Stamp Monthly editor-in-chief
Scott catalog editor emeritus
Scott catalog editor-at-large
Scott catalog new issues editor
Scott Stamp Monthly managing editor
Scott catalog contributing editor and Scott Stamp Monthly senior editor