The box is located at the Park and Ride lot near Sycamore Valley Road and Camino Ramon.
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It had been worked on earlier on Sunday, but was not properly closed and locked.
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The lid was left open for about an hour Sunday afternoon.
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Town of Danville spokesperson said there's no evidence anyone's ballot went missing or was mishandled.
But if you dropped your ballot off and have concerns - you can contact the Contra Costa County registrar.
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What's difference between an absentee and mail-in ballot? Very little