in the unseeing eye quest...what are the gold bones in the coffin used for??

It is for another quest, just keep them.

well i've already beaten the game once and never used them...i'm starting a new one and was just wondering what they were for in case i got them again
thanks

Luvian is most certainly correct. .
Partial Spoiler!!!
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You will meet the owner of that portion of golden bones somewhere in the docks district. It is an important quest and the bounty recieved upon completion is among the best in the game. .

Since we are into spoiler, you will have to go in the bridge district sometime while doing this quest.