“Upstanding citizens” found hundreds of ballots on the side of a road and turned them in — undamaged and untampered with — in Florida’s most populous county. Containers filled with ballots of Miami-Dade County voters fell out of a county truck when a worked “forgot to lock the back” of the vehicle, Christina White, the county’s elections supervisor, told the Miami Herald on Tuesday morning. The worker drove off and a sealed bin and sealed bag fell out, she said. White said the containers remained sealed and the ballots inside were previously scanned and tabulated at an early-voting site a day …