It doesn't matter, because a single postman or a single ballot box being tampered with isn't enough (in virtually all cases) to swing any major elections. Any

It doesn't matter, because a single postman or a single ballot box being tampered with isn't enough (in virtually all cases) to swing any major elections. Any coordination to defraud paper ballots on a scale large enough to change the result of a major election would require so many individuals that it would be implausible for them to all keep a secret. Massive election-changing widespread fraud of an electronic system could in theory be completed by a single individual acting entirely alone.