SE allready has this sort of code implemented - remember Shinryu.
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Seriously, its so insulting when you see a piece of R/EX you already got in your chest...such a waste. but i ll quote our good friend camate "its working as intended and a silver ore is your credit for winning!"
I've gotten 5 Ganesha's Masks. I didn't want any of them. The VW drop system is the worst drop system ever imagined. That is not an exaggeration. It is actually the worst drop system, in any game, ever.
The VoidWatch drop system is a joke. A horrible, horrible joke. Whether or not it's working "as intended" is irrelevant. It needs to be re-worked.
Low drop rates is one thing, I can live with that. But the fact that one person can get the same ra/ex item multiple times, is beyond stupid. I'm going to assume SE made it like this so any ra/ex item can't be sold. But yeah, instead I have to watch a linkshell member get the same ra/ex body 3 times in 4 fights, once on main character and twice on mule, and neither character can equip it. I like voidwatch as an event, but the sheer randomness of drops and the fact that you cannot add any ra/ex item to treasure pool, is discouraging and infuriating and saddening all at the same time.
And no, we don't get equally compensated for our efforts in a vwnm fight. Getting ram horn, ram skin, ahriman tears and ebony log after killing Akvan, isn't being compensated, it's an insult. Even more so when someone who never ever plays mage (he has rdm and whm leveled but not geared or anything), gets the mage body - which he never wanted. At the very very least, getting one heavy metal plate per fight should be guaranteed.
Shinryu and a lot of abyssea mobs for that matter won't drop loot if everyone in the party already has it. I assume this was to stop people from shout selling stuff on a whim. Either way the server performs a check on what items everyone has at some point and prevents it from entering the pool. I'm sure that code could be copy/pasted to chests easily enough. Not that it would fix anything. The loot system would still be terrible. Now if it performed the check and instead of making an item just not pop in your chest it made it pop in someone else's if you already had it, that would be a different story.