code: public static BoxItem.Info getSharedItem(BoxAPIConnection api, String sharedLink) {
          return getSharedItem(api, sharedLink, null);
      }
docs: Gets an item that was shared with a shared link.
  @param  api        the API connection to be used by the shared item.
  @param  sharedLink the shared link to the item.
  @return            info about the shared item.