Toshiba market place remove tool

I have a question about Toshiba market place remove tool. I had to swap out my original Toshiba thrive at Best Buy under their 14 day return policy as I could get no sound out speakers, confirmed by a Toshiba Technician. The problem is I have two Toshiba Thrive's listed in the market place. I cannot figure out how to remove the returned tablet from the list.
