Downtown (DN) and ANF are the default BRANCH and LOCATION for all bib/Carl BID records. Pay attention to the grid under the bib/Carl BID information for the specific BRANCH and LOCATION for the individual items located at each library.
Links:
[1] https://my.metrolibrary.info/drupal/tags/carl-bid
[2] https://my.metrolibrary.info/drupal/tags/branch
[3] https://my.metrolibrary.info/drupal/tags/item-maintenance