Query item if has been special ordered??

I am trying to see if an item has ever been special ordered. However, when I do a query I get all special orders.
From PostMan:
https://api.lightspeedapp.com/API/Account/{{accountID}}/SpecialOrder.json?load_relations=[ "SaleLine.Item"]&SaleLine.itemID=507
It should return 0 items, this itemID has never been on a special order.
Am I missing something???
Basically I want to see if item #507 has ever been special ordered? Not just ordered...