I actually did call Shure with the first pair before I set up the return with Amazon. The woman told me that it'd be 10 business days and I'd still have to pay to ship them to them. From previous experience I knew I'd get another pair from Amazon in half that time and $5 back on shipping is better than nothing. To be honest I was somewhat taken aback by how long the Shure lady said it would take.
Is there something special that I'm supposed to tell them in order for them to offer overnight?