You may ask how do you make sure nobody changes the votes in the box somehow? First the box is in front of everybody. Second, before allowing people to throw v

You may ask how do you make sure nobody changes the votes in the box somehow? First the box is in front of everybody. Second, before allowing people to throw votes in, you seal the box with an tamper evident seal. Usually pouring beeswax over a string works. You can have multiple seals for all sides. Having a mark anywhere else but the box you cross / stamp invalidates the ballot. You put ballots in envelopes. Each envelope must have a single ballot inside. A voter can replace the ballot if they made a mistake. They need to destroy their ballot in front of everyone.