I did have to confirm it was a new installation then I received the below email.
Please email us the documentation showing that you have installed certified uAvionix skyBeacon. We will not be able to approve your rebate claim without the documentation. Please send us a jpeg file if possible and make sure it does not exceed 5 mb.
We will need evidence of new ADS-B avionics installation with following methods:
1.Clearly visible bill of sale indicating the owner’s name, equipment and part number, serial number and date of purchase or uAvionix packing slip or
2. A copy of the FAA Form 337 that includes the above information.
Documentation should be submitted to ADSBRebateHelp@faa.gov.
It wasn't an issue since I had proof of purchase but it was just another hoop that I wasn't expecting.