Also consider what you are saying about the ballots, that if a bad person gets access to them post facto, that that is bad.
Neither of those things should be true in a well functioning election system. If the machines are vulnerable to a bad person touching them, then scrap them all.
If the ballots can be tied to voters (as is the accusation in AZ), then the system is broken. MUCH work has been put into to preventing that from being possible. If it is possible, then the election is flawed.