Amazon returns

Today the '1' key in the keyboard I recently bought on Amazon stopped working.  I can't really work with an unreliable '1' key.  So I set to return it for a replacement.  I did what I needed to do on Amazon, printed the forms, found the original box and another cardboard box to ship it in, packed everything, taped it, and left it for the postman to pick it up.  After 5pm I checked that the postman had picked it up, and then I realized... I had continued to use the keyboard and never put the keyboard in the box... the box that's off to Amazon is empty...