How to get custom field value from Woocommerce ORDER page?

Question

WooCommerce

I send an order confirmation letter, you need to send the address of the pick-up point to the client by mail.

The next option doesn't work!

$metas = get_post_meta( $post->ID );
        if( isset($metas['boxberry_address']) ){
            echo 'Мета поле "boxberry_address" существует, не важно какое там значение.';
            echo $metas['boxberry_address'];
        }