Title pretty much says it all, I’ve been looking through the documentation portal and github account for Particle-iot, but I’ve only found gerber/eagle drawings for the Boron, Electron etc.
Which leads me to the question - Is the B523 files publicly available?
The production-class devices (E Series, B Series, and Tracker SoM) are closed-source designs. There are pictures of the schematics in the datasheets, but no Eagle CAD or Gerber files.