Amazon has fulfillment center generations. They usually don't automate existing fulfillment centers; they build new ones and close the old ones. Kiva robots went in at Gen-8, in 2014.[1][2] Breinigsville PA was built in 2011, so it's not a Gen-8 center but is too new to replace.

[1] http://www.scdigest.com/ontarget/15-03-03-1.php?cid=9051 [2] https://vimeo.com/113374910