No. Any attempts at cheating caught live just invalidate that bulletin (and said cheater is brought to the police). With a well organised setup (having a record

No. Any attempts at cheating caught live just invalidate that bulletin (and said cheater is brought to the police). With a well organised setup (having a record of who already voted, having a transparent ballot box that is only open for a moment when your identity has been verified, multiple assessors watching for the extremely obvious "hey there's multiple envelopes that fell in there"), cheating is already extremely hard, for almost no gain. Maybe you can stuff two votes instead of one, but at what cost, potentially invalidating hundreds for your candidate ? And since voter counts are recorded and compared to bulletin counts, even a difference of one will start an inquiry and potentially invalidate. If you multiply the voting places, where instead of having a single place which will tally over 10k votes, have 15 places that tally 700 votes each, you have now made both cheating much harder, and less worth it in the scenario you propose.