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A call from an alert Tri-Valley resident led to the arrest of four men in a mail-theft ring that spanned four counties, including cities in Contra Costa County.

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CalMatters is a Sacramento-based nonpartisan, nonprofit journalism venture committed to explaining how California's state Capitol works and why it matters. It works with more than 130 media partners throughout the state that have long, deep relationships with their local audiences, including Embarcadero Media.