Don't believe you can dismantle them since they sit in your "missions" part of your inventory. The quest doesn't automatically start. Once you have all 4, on the 7th day of the month, a mission will appear called "The First Firewall". Do that mission and complete it to start the quest.
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Do the Dvalin items still drop? Or only on the 7th?
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They drop anytime. It's a grind though.
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Cheers buddy. Puts my mind at rest.