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use File::stat  qw(:FIELDS    );
use File::Find  qw( finddepth );
...
  }
}

mysql> select file_id, file, size from files where size < 0;
+---------+--------------+-------------+
...
|  611851 | pagefile.sys | -2147483648 |
+---------+--------------+-------------+
4 rows in set (0.32 sec)