Here the ballots are printed in normal paper. Each party prints their own, and the goverment send them to the polling stations. But other parties may steal the ballots from the voting booth, so each party must print additional ballots to replace them, just in case.

There is a plan to make a single ballot printed by the goverment, but the local county chiefs don't like it becuase it avoids a lot of dirty tricks. (The elections are quite fair anyway. The petty cheating just changes very little globaly. I don't agree with cheating, but I can't fix it.)

Some parties distribute their ballot before the election to avoid the missing ballots problem. Some local county chief ever distribute their own local ballot with the national ballot of the opposing party if people want to vote a combination. Some people distribute old ballots to that are invalid to void the votes of confused persons of the other party. In some places, the rabbit hole is deeper than you think.