Micro dots are a thing frens. I work in the printing industry.

Xerox Palo alto invented the technology and it was first used on digipath scanning and docutechs! If the printer is networked the rabbit hole goes even deeper!

Firewall or not these images when scanned will go directly to government servers.

https://www.xerox.com/downloads/usa/en/d/Dataglyphtech.pdf

https://www.washingtonpost.com/news/morning-mix/wp/2017/06/09/how-tech-sleuths-cracked-the-mysterious-code-that-turns-your-printer-into-a-spying-tool/