I would assume the voting machine is asked to load ballot data onto a USB drive.
The USB drive would probably then taken to a tabulating computer.
Those USB drives should have been kept and it would be easy for a supervisor of elections to make a copies for a freedom of information act request.
Even if a voting machine gets reset, its ballot data should still exist on a USB drive, and probably on a tabulating computer drive too.
USB drive contents are soooooooooo easy to change.