function foobar_metabox_callback( $post ) {
    wp_nonce_field( basename( __FILE__ ), 'metabox_meta_nonce' );
    $metabox_stored_meta = get_post_meta( $post->ID );
    if ( has_post_thumbnail() ) { ?>
    <p>
        <!-- show results -->
    </p>
    <?php } else { ?>
        <p>No Featured Image not loaded</p>
    <?php
    }

    // test the meta content
    $getPostCustom=get_post_custom();
    var_dump($getPostCustom);
}