Each season the Arizona Diamondbacks sponsors “Mystery Ball night at Chase field. In the rotunda near the team shop will be tables set up lined with black paper sacks the size of lunch sacks.

Fans are able to purchase one of these sacks for $40 with all proceeds going to the Arizona Diamondbacks Foundation, the charity arm of the team. Inside the sack is an autographed baseball signed by an Arizona Diamondbacks player or a Major League Baseball player from another team.

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