Hopefully this is enough proof to not be
another edge case, but I did some work for a brew pub I visited, converting their beer menu over from Google Sheets + Chromecast (which was constantly down and causing issues for them) to a Raspberry Pi-based setup. They bought the Pi and I mailed them a microSD card with a basic Linux installation that had reverse routed SSH access for me to use, and once they plugged it in I set up the display software and everything else for them remotely.
Funnily enough, although this work was done over the internet, my payment was mailed as a check. I still have it around if a picture of it is needed for further proof, but I elected to use the pay stub from below the check instead, since there would be more to redact on the check (routing numbers and such).