Which purple coins drop from what bosses and where in Lord of the Rings Online

Fil Gashen - Platinum coin of Hand - GLOVES (10 radiance)
Grant Stair - Platinum coin of Courage - BOOTS (10 radiance)
Skumfil - Platinum coin of Resolve - LEGGINGS (10 radiance)
Forges - Platinum coin of Strength - ROBE/BP (10 radiance)
Vile Maw - Platinum coin of Heart - SHOULDERS (20 radiance)
Vile Maw - Platinum coin of Spirit - HELM (20 radiance) 16th Hall - Iron coin of fortitude - SHOULDERS (10 radiance)
Dark Delvings - Iron coin of knowledge - HELM (10 radiance) So far it seems like the copper coins (for the 6piece purple set) are random drops from most boss chests.
eg in Fil Gashen we have copper coins of Heart, Resolve and Hand drop during various runs. I could be wrong though, perhaps they are restricted to particular chests. for more detail come to http://www.mmogoldservice.com/lotro-faq-which-coins-where-guideitem.html