List of all the winners in the order NPC-s were found:

Winners	NPC found	Reward
Jp	Genie	Mystery Box, 50 EP
Str8att7	Assassin	Bow-Sword
Charr	Easter Bunny Jr	Bunny Ears
Bertietank	Pretty Lass	Mystery Box, 50 EP
Angila Joli	Suspect	Mystery Box, 50 EP
Jandar	50% Luke	Mystery Box, 50 EP
Emps Loover	Bush	Mystery Box, 50 EP
Angila Joli	Rune Guardian	Mystery Box, 50 EP
Emps Loover	Queen of Snow	Mystery Box, 50 EP
Angila Joli	Barrel	Mystery Box, 50 EP

Congratulations to the winners and thanks to everyone else for participating!

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Thanks to Iron Corne for reminding me to add the exact locations!

NPC	Location
Genie
Assassin
Easter Bunny Jr
Pretty Lass
Suspect
50% Luke
Bush
Rune Guardian
Queen of Snow
Barrel

Purple arrow shows the entrance to a dungeon.
Blue arrow shows a shortcut or a ladder/entrance/gate etc within the same area.
Yellow arrow shows where the NPC was positioned.
Green arrow shows a nearby teleport location.

The NPC-s will stay in their spots for a week, so if you didn't find them during the event, you can find still look them up.
I can give more details if required. Just contact me in game.