private function find_hours_set( $shortcode_atts ) {
		if ( ! empty( $shortcode_atts['hours_uid'] ) ) {
			// the hours identified by this unique id
			return $this->find_hours_set_by_uid( $shortcode_atts['hours_uid'] );
		} elseif ( is_singular( INVP::POST_TYPE ) ) {
			// is there a location attached to this vehicle?
			$location_terms = wp_get_object_terms( get_the_ID(), 'location' );
			if ( ! empty( $location_terms ) ) {
				$location_slug = $location_terms[0]->slug;
				$sets          = $this->find_hours_sets_by_location_slug( $location_slug );
				if ( ! empty( $sets ) ) {
					return $sets[0];
				}
			}
		} else {
			// no specific set or location identified.

			$location_slugs = get_terms(
				array(
					'fields'     => 'id=>slug',
					'taxonomy'   => 'location',
					'hide_empty' => true,
					'orderby'    => 'term_id',
					'order'      => 'ASC',
				)
			);

			// are there terms in the location taxonomy?
			if ( 0 < sizeof( $location_slugs ) ) {
				// take the first set of hours we find
				foreach ( $location_slugs as $id => $slug ) {
					$sets = $this->find_hours_sets_by_location_slug( $slug );
					if ( ! empty( $sets ) ) {
						return $sets[0];
					}
				}
			}
		}

		return null;
	}