"Once it is turned into a boxed set, the only way to convert it back to single components is to have a GE clerk exchange the boxed set for single items. You can NOT right click on a set and use the destroy option to do this. Simply right click on Sets Grand Exchange clerk and once your GE Item Sets window pops up, right click on your boxed set that's in your inventory, and choose Exchange (type) armour set."
As quoted on the following link:
http://runescape.wikia.com/wiki/Grand_Ex…
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