Not all pages in BornFree were converted to Drupal. All pages were reviewed prior to conversion and almost one third of pages were marked to not be imported.
In other cases a page may have been retitled or altered in some way to make it function correctly in Drupal.
To find a page that existed in BornFree, try going to the same URL but in Drupal. If a page was at www.grinnell.edu/academic/sociology/faculty, try going to webblade.grinnell.edu/academic/sociology/faculty