I just got a letter 4 weeks to the day that i sent mine in. It said I did not include the serial number, please write it down and send the letter back in, then wait another 4 weeks.
Funny, I distinctly remember cutting out the freaking cardboard label from the shipping box, putting it in the envelope with extra stamps for the weight.
I HATE REBATES THEY ARE USELESS TO CONSUMERS! Just lower tha damn price!