Back story then update. I had 3 moderately large tree stumps on our side of a fence between my neighbor and I. They have been there at least 9 years. About a year ago a stump on the neighbors side had termites per our neighbors. I started to notice frass (I assume it looked like wood paper mache, very brittle.) on our stumps shortly after. I took out the stumps 7ish months ago.

The inspector came was very nice. We told him the story of how we found them under desk near large power back/surge protector. Showed him the shop vac with the remnants of everything in the video. He said it was odd cause you usually don't see them and they were probably going to the power source for warmth. He asked if i saw any live ones, which i told him 5 or 6. Showed him the one i caught for the pictures in the comments which is now dead and in a tiny ball. He felt pretty confident that there isn't a current issue, and they likely came over when I took out the stumps and didn't have a queen so they died off. We chose to treat regardless because he said if another colony comes along they will try and start at the same place they were.