Got mine, 2 phones, $200 in about a month, but waited till end of 30 days to send in because they will verify you have the phone 30 days and can't trade it back in.
The forms are ongoing, so if you have a doubt about form versus when you bought phone, go online and print one for that date, or check store. Probably prevents someone from waiting a year (however they have kept your money and probably made some off of it, so never hesitate to submit).
If you want to check status, look for sprint rebate (google) something like that. You can enter your phone number to check status, so much easier to see if they have it, progress, or problems and no long phone call