Now how does it happen in other states? You should know exactly how many ballots are missing from each precinct. The precinct judges from the precincts that "lost" those ballots better be getting their butts reamed for this. And if no one knows which precinct they came from then the entire election board better be tossed for incompetence.
In Arizona you can register for early voting which means you receive your ballot in the mail and you have up until election day to mail it back or physically drop the ballot into a box at your polling place. I took mine, my husband's and my daughters ballot to the polls, walked in, and dropped them in a box. No registration, signing in, etc. The ballot is sealed in an envelope with your name, birthdate other info and must be signed and dated on the outside. Those that voted in person filled out a ballot which was scanned in the voter's presence. Not sure what is then done with the physical ballot.
Not saying the ballots found were legit, just another reason why voting any other way but in person at the polls is a bad idea.