When the scammers spoof numbers they usually just get a block of random numbers that are local to where they are calling, then they just try them one at a time. They pick numbers that look local because people are more likely to answer.

They never actually bother verifying whose number they're using though, so it frequently results in them calling from the persons own number who they are trying to scam, local businesses, and even local government numbers.

I work for the phone company and I've frequently gotten calls from people telling me someone just called them from their own number lol