If the hints are too subtle for your party you can always make them more obvious. Instead of stating the above Davik could ask them a question. Either why they carry the amulets, or if they work for Staggy depending on how blunt you want to make it. This way the dialog is opened before there is a chance to brandish a weapon and once people start talking they tend to keep talking.
This at least from my experience of a few years of DMing an intelligent but dense party (Guessing average real life stats of Int 16, Wis 8 :P). No shame in spoon feeding them when needed if it helps the campaign.