Now the DHS says they have 32, no plans for more.
http://www.hstoday.us/industry-news/general/single-article/claim-dhs-putting-thousands-of-armored-personnel-vehicles-on-streets-not-true-dept-says/7c43624e204e539aa05cc73f772d6c58.html
Doesn't your link say that DHS has 16, and that the Customs/Border Patrol has 16?