I recommend keep them and taking them to the polling place on election day.
Make sure your vote has not already been cast via mail or early.
Vote.
If you find that your vote has been stolen, request a provisional ballot and vote.
Once your done voting, destroy them so that no one can use them.
Walk out with the shreds.
I’ve already destroyed them. Will probably get another one before election day if so will take that to the polling place. If we even have an election in November.