Didnt notice server coming down soon messages, handed in a present with several toons, then server came down. Got back in game after reboot, and did not retain credit for handing in to the npc, but was still 1 present short to be able to finish quest because of the minor rollback from not camping.
Went back to santa clause hoping he would give more presents in case you happen to lose one somehow, whether rollback / accidental destroy / etc. but he just says "you already have that task", but is now unfinishable.
It's no big deal, as I can abandon and re-obtain, but it is a bit frustrating to only have 3 npc's left to turn into and something like this happens and you can't finish it because your 1 present short with no way of getting any more from the quest giver.