Insert code in 1's below at line 679 of tbaMUD 3.62's act.informative.c for 'look container' to show closed containers as closed when looking at them:

...
  /* If an object was found back in generic_find */
  if (bits) {
    if (!found)
      show_obj_to_char(found_obj, ch, SHOW_OBJ_ACTION);
111111111111111111111111111111111111111111111111111
1   if OBJVAL_FLAGGED(found_obj, CONT_CLOSED)     1
1      send_to_char(ch, "It is closed.\r\n");     1
111111111111111111111111111111111111111111111111111
    else {
      show_obj_modifiers(found_obj, ch);
      send_to_char(ch, "\r\n");
    }
  } else if (!found)
    send_to_char(ch, "You do not see that here.\r\n");
}

ACMD(do_look)
...