I just got the same rejection letter. They are correct: I did not send the original receipt or packing slip. Why? Because the rebate form did not ask for it!

If you still have the PDF file, take a look. They are attempting to change the rules after the fact.

I am trying to keep an open mind, but it's hard not to conclude that this is and was always intended to be a scam.

Edit, May 17, 2010: Since I wrote the above, a number of people have reported receiviing their rebates, so the rebate program cannot be considered a scam. There are still some legitimate questions, though, about the way it was conducted, why the rules were changed, and why some of us who are entitled to the rebate have not received it.