We'll the Salvage group I've been on has done well over 20+ runs and never once did they see a piece fall for the WHM Marduk stuff. Then on the run I got this item, we had a 2nd fall within 10 minutes; one from a Troll Paviser (spelling?) and then one from a pop Spider from the Rampart. So hang in there and you'll eventually see them all... submitted screenshot too... hopefully see it.