public function databoxes()
    {
        if (!$this->databoxes) {
            $this->databoxes = [];

            foreach ($this as $record) {
                if (false === array_key_exists($record->get_databox()->get_sbas_id(), $this->databoxes)) {
                    $this->databoxes[$record->get_databox()->get_sbas_id()] = $record->get_databox();
                }
            }

            $this->databoxes = array_values($this->databoxes);
        }

        return $this->databoxes;
    }