It is a gift giving system for holidays, events etc. It allows you to give custom gift packages on the fly to bankboxes of all accounts. You can also choose the items and their amounts manually or use the random items button. If you need just one giftbox as a reward you can add the giftbox to your own backpack to give out to a player. To call the gump use the command "[EGiveReward". This is a drop in script no edits should be required.
I have not tested this on ServUO only on RunUO.