Forget mail in ballots. And drop boxes. Show up with a legal ID and vote in person. Hand count and turn in count add them up.
Texas has a robust mail-in ballot system with numerous safeguards. My mother sent in her ballot request which had a very narrow window to receive it. To vote, She had to provide her ID, and the person who handled the ballot (to mail it, etc.) had to provide a signature and an ID as well. Any deviance from this protocol invalidates the ballot.
Texas doesn’t allow drop boxes. At least not legally. Ballots must be delivered by common carrier.