the getitem <item_id>, <quantity>;
it can be -->
getitem <item_id>, <quantity>,<item_id>, <quantity>,<item_id>, <quantity>,<item_id>, <quantity>,<item_id>, <quantity>;
right ?
Another way you can do this is take some time to make a custom item gift box for your server. That way you only need to use getitem script once. Once they double click the box, it gets all the desired items you put in there. I think it looks much better too aesthetically