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1 pointLook for the Hunter YouTube vids and they will usually walk you through all of the Hunter spawns which get you the Ivory keys (and masks) when you kill the hunters. There is / was a bug with some Hunters not dropping masks and keys. I hear a patch for this is coming probably with the July update. The chest to unlock with the keys is by the barbers in the White House (to the right of the vendor, opposite side to the crafting station towards the clans room). I have two masks missing and am pretty sure I know where one is missing (the last of the 4 Hunter spawn didn't drop a key and that was the most difficult PITA one to do solo). I hope to complete after the patch drops.