From the CyberNinjas audit report:
255,326 early vote ballots were received from Maricopa County voters who were not found in the EV33 file.
The importance of this finding is that it's a violation of state law to send out an early vote ballot to a voter who has not requested one. Once a voter has requested an early ballot, their name goes in the EV33 file.
Why were more than 255,000 early vote ballots sent to people who did not request them?
Source (Pg. 51)