[Nabeshin]

As per title, it's too early for me to hit our favourite shop just yet, so I'm planning to get an item from the warehouse at a fairly good price and later on, think a month or so, I could buy it (with a third part account maybe?) new and send back the used one telling them that I'm no longer interested in it.. would it work?
It's not an item that has an IMEI or anything, a serial number maybe, but I doubt they keep track of that, and I could send the used one in its own box so the SN matches what's inside
What do you think?