Related posts and custom meta_box?

Looks like you will have to use

$meta = get_post_meta($post->ID, '_selected_post', true);
echo $meta;

The registered post type is hidden using the _ and it’s name is defined at the line :

$this->meta_key = "_selected_{$this->SELECT_POST_TYPE}";

Where SELECT_POST_TYPE is defined as ‘post’ at the line :

var $SELECT_POST_TYPE = 'post';

Hope it helps.

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