The decision will allow all three players to become free agents.
Miller didn't pan out with the Diamondbacks after being part of a Dec. 2015 trade with Atlanta in which Arizona sent 2015 No. 1 overall pick Dansby Swanson to the Braves as part of the deal.
Miller, 28, appeared in just 29 games (28 starts) in three seasons due to injuries and underwent Tommy John surgery in 2017. He was 5-18 with a 6.35 ERA, including an 0-4 mark and 10.69 ERA in five 2018 appearances (four starts).
Boxberger, 30, recorded 32 saves for the Diamondbacks last season while going 3-7 with a 4.39 ERA. Overall, he is 20-27 with a 3.42 ERA and 76 saves with the San Diego Padres (2012-13), Tampa Bay Rays (2014-17) and Diamondbacks.
--Field Level Media
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