Backdated DoG?

A donor wants a backdated deed of gift for 2024 taxes. They DID donate late in 2024 but never sent insurance values so the deed was completed and sent by the museum in 2025. We were able and ready to send before the end of the year, but donor didn’t get the info to us. We used docusign; should I just void it and backdate to the day we received the donation?