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The Piepkorn Papers (148 boxes) are located in:

The Archives of the Evangelical Lutheran Church in America
321 Bonnie Lane
Elk Grove Village, IL 60007(near O’Hare Airport)
(847) 690-9410 
www.elca.org/archives
Email: archives@elca.org

The files (28 boxes) Piepkorn compiled for Profiles in Belief take up thirty running feet on the shelves of:

The Library of the Graduate Theological Union
Berkeley, CA. 
http://gtu.edu/library
Email address: libref@gtu.edu

The Concordia Historical Institute, one of the best church related archives in the US, has a significant collection of resources on Arthur Carl Piepkorn, especially relating to his career in the military chaplaincy and his research on the use of historic vestments in the Lutheran Church. 
804 Seminary Place
Saint Louis, MO 63105-3014
www.concordiahistoricalinstitute.org
Phone: 314-505-7900
email: chi@lutheranhistory.org (general);
reference@lutheranhistory.org (for assistance with research)

Lutheran Legacy. Mission: “To Provide Access to Primary Works from the Ages of Lutheran Orthodoxy through Preservation, Translation, and Publication”
http://www.lutheranlegacy.org