Treasure Hunt event

One possible event that i had in my head was treasure hunt. Basically when killing one of the boss npcs, there is a slight chance of it dropping a treasure map. the player who picks it up has the choice of either handing it in to their mission holder/kage or keep it to discover the treasure for themselves. If they pick the first option, the player will be rewarded with some bonus exp, bonus ryo, some extra vps, and the village also gets some increase to their rep. If they pick the second option however, the game will give an announcement that this player has gotten the treasure map and will announce his coordinates every 10 minutes for the chance to kill and obtain his map. if the player manages to escape death and head to the spot pointed out on the treasure map, the game will announce that since the player has located the treasure in the map he gets all the reward mentioned in the first option along with a bonus reward of a random item which can range from a couple of kunais to the most valuable which is a .01% chance obtaining a ticket to a free thing in the event shop whether it be a free 100k ryo to gaining a special.