Why so complicated, are you really need this ‘Message’ field?
function stat_meta_box( $post_type, $post ) {
add_meta_box(
'stat_box',
'Summary',
function(){global $post;var_dump($post);}, // just for example
array( ), // blank or list of your post_types
'advanced' // or 'side'
);
}
add_action( 'add_meta_boxes', 'stat_meta_box', 10, 2 );
no extra queries or function chains but the same result
