Playing devil’s advocate, it will need to be shown that these 17,000 have actually moved out of state. If we say 17,000, even if the vast majority of those really have moved out of state, the MSM will find examples of a few who were temporarily staying with relatives out of state or who were temporarily staying at 2nd homes out of state and use that to try to discount all 17,000.
With access to tax records, authorities could easily straighten that out. Of course that would require interest by law enforcement, not a former FBI agent. The Georgia Dept of Revenue should be interested. They could easily crosscheck voter registrations with Georgia tax returns. It appears to me that Georgia taxes all income levels, a 1% rate for incomd of $0 to $750. Standard deduction is $4,600/$6,000 single/joing, so most residents must file returns.