def _conversion_checks(self, item):
        """
        Internal use for checking if a duplicate safe attribute already exists

        :param item: Item to see if a dup exists
        :param keys: Keys to check against
        """
        safe_item = self._safe_attr(item)

        if safe_item in self._box_config['__safe_keys']:
            dups = [f'{item}({safe_item})', f'{self._box_config["__safe_keys"][safe_item]}({safe_item})']
            if self._box_config['box_duplicates'].startswith('warn'):
                warnings.warn(f'Duplicate conversion attributes exist: {dups}', BoxWarning)
            else:
                raise BoxError(f'Duplicate conversion attributes exist: {dups}')

        Internal use for checking if a duplicate safe attribute already exists

        :param item: Item to see if a dup exists
        :param keys: Keys to check against
        
dynaconf/vendor/box/box.py