Drupal 7 Block programmatically display on basic page

I have a Drupal basic page that display block on the page. I am trying to edit the region of the block, however on the Admin->Structures->Blocks, the region for the block is set as None and there is no specifications on the setting how Block is displayed. I have been looking through tpl.php file to see if this page was customized, but page is just basic page within the Drupal. Any idea where/ how this block is displayed?

Thank you