| Crimeo |
Yes I would say that is an "item."
Also note that since heavy armor doesn't actually have any canonical rules for what sounds it makes, this would all be totally subjective no matter what you rule, as to what sculpt sound would do in game if cast on armor. So in a certain sense it barely matters anyway if it's an item, because copious amounts of GM whimsy are going to be part of the process no matter what.