clipperfixer: Thank you for the response. I did not think that there would a phone number listed anywhere; I somehow feel that these rebate centers try to be as inaccessible as possible.
Anyhow, after reading your response, I looked up the original coupon page, found a toll-free number and called. After some wait, I found a CSR who took all my details and went to investigate. After being on hold for five minutes, I was told that she had looked at all my paperwork, everything was fine, and I should receive my check in 4 to 6 weeks. I asked about the status message on Web-Rebates.com. She said that would get updated in a few hours and should show up as listing No errors. I guess I will give it 24 hours and see if they have updated the status.
Once again, thank you for inspiring me to do something.