The problem is mail in ballots, not the box they are placed in. Any ballot put into those illegal boxes could have been and can still be placed in the US Postal Service mailbox. Elections will remain insecure until they are handled in person, with government issued photographic ID, and blockchain receipts that allow a voter to check that their vote was correctly recorded for the candidate it as cast it for. Until that happens they can cook the books and you'll never be able to prove it without a Court order which they won't ever give you.
The problem is mail in ballots, not the box they are placed in. Any ballot put into those illegal boxes could have been and can still be placed in the US Postal Service mailbox. Elections will remain insecure until they are handled in person, with government issued photographic ID, and blockchain receipts that allow a voter to check that their vote was correctly recorded for the candidate it as cast it for. Until that happens they can cook the books and you'll never be able to prove it without a Court order which they won't ever give you.