No I haven't broken down any of the lore of the symbols yet in the books. It's more like extra trivia since I didn't make the books illustration heavy or with a guide qwq

so the symbol privacy has on his bag is the eastern Media monorail which looks like a tilde ~ https://f2.toyhou.se/file/f2-toyhou-se/images/96519956_UCMHfAt8rsAbH0L.png (the black line on the right side of the map) The only other character I have with it so far is Mercurial (in his cat form) https://f2.toyhou.se/file/f2-toyhou-se/images/40187632_zaAaDXg6v2Kgmdt.png?1632690661 

He has a letter because he is a courier, and inside the letter is the symbol for Media https://f2.toyhou.se/file/f2-toyhou-se/images/96477415_VIz8YnHjPRz6qFe.png which is a tear drop with branches extending out.

His outfit is monochrome because Eastern Media's colors are all monochromatic black and white.

Router is a Central Media Monitor, so her symbol is eye shaped 👁 with the median symbol inside. Hers is yellow, which matches her eyes, which is what Central Media generally follows for their uniforms. 

And so that's the story about their outfits! You can see rough sketches for each occupation here https://toyhou.se/1050047.symbols-and-resources/gallery#57681279 

I have not yet posted the Noble collar guide on my TH but now that you mention it I should get it on there. I only have shared it in my discord so far whoops xD I hope what I wrote above helps in the meantime though!