Update meta-boxes.php

Use following function to add_filter within another plugin:

function epl_listing_meta_boxes_callback($a) {
	foreach($a as $k=>$v) {
		if($a[$k]['id'] == 'epl-property-listing-section-id') {
			$a[$k]['enable'] = false;
		}
	}
	return $a;
}
add_filter('epl_listing_meta_boxes', 'epl_listing_meta_boxes_callback');