expanded for convenience sake, enjoy:
Code:
sub EVENT_ITEM{
if($itemcount{itemid} == 0){
quest::say("I'm sorry, I don't need that item, $name. Here, you can have it back.");
if($item1 > 0){quest::summonitem("$item1");}
if($item2 > 0){quest::summonitem("$item2");}
if($item3 > 0){quest::summonitem("$item3");}
if($item4 > 0){quest::summonitem("$item4");}}
}
Just add as many $itemcount checks as you have items for the quest.