My hands are itching!!!

I just bought a 32gb wifi black this morning and i havent opened it yet cuz I thought someone will do a trade of the one I want which is a 64gb 3g att black and of course I will pay the difference for it. If I open it and use it till I get the model I want will I still get at least retail price I paid for the 32gb? Its so hard its just sittin here!!!