I did the same thing... well... the guys I hired to help me unpack and move the printer in to the store threw the box away and, of course, the next day was trash day so that was that.
I called Jason at Shades of Paper where I bought it and tho it took a bit of poking of Epson, we finally got my rebate.
Jason ... the best there is!!
Sorry, Randy... I'm sure you are, also!!