The simplicity of a salt isn't the issue, it's the size. More salt confounds the process.
As for the question of your ballot being void, you can't know. Any more than you can know that your ballot didn't somehow end up in the river or burning in someone's fireplace before it made it's way to be counted (as I said, not perfect).
However, the election officials and press observers can know if a lot of void ballots get checked from residential addresses (remember, validating void ballots triggers an investigation). Presumably, the large number of void ballot validations after the election might cause such measures as enabling voters to check if their ballot is void or not (now that the election is over and the controversy is starting to boil).
At that point, nobody will be able to prove that their particular ballot was meant to count but was issued void, but there will be enough people complaining that it becomes evident something is wrong and likely of a criminal nature.