So I submitted my old phone for the AT&T trade-in att.com/tradeinprogram. I provided my old phone ID and email address, but I have not received any response to that email yet. And I wanted to check the status to see when I will get the shipping materials and follow up on it. And it's asking for an invoice number, Which is apparently different than an order number. I'm not sure where to find this invoice number? Can someone help?