I just had final contact with ATF guy about taking a rifle that I never converted out of the "Registry". Also info about refunds ......
If it helps anyone here's my experience:
In OCT 2022 I called ATF to ask how to go about doing process. I was told by nice ATF lady rep on phone I could send an email and she provided the address. I sent it shortly after
A few weeks went by, I called back to inquire status, they were able to see that an email had been received and was on someone's electronic desk.
In mid JAN 2023 I get an email from an ATF guy saying I needed to forward a signed letter, which included all info I provided in email to them. He did not specify how or where to send it.
I typed a letter, signed it and sent an email copy to him and same day opened a question on ATF Eforms page regarding same question of where to send it and also if a refund was possible (wasn't sure who I'd hear back from first).
The next day both responded. The guy said that they had "removed the item form the purview of the NFA as it was not made." As all info was sent to this person, I am satisfied that gun is in the clear in order to sell (with copies of email and letter to buyer).
The response from the eForms page said I needed to send things to an address with copy of the stamp. This response may have been because of my refund inquiry.
I had inquired about a refund for the unused tax stamp. The ATF guy advised that refunds are only available for stamps issued in past 3 years (I was over this time frame). He provided this link for that info
regulations.atf.gov
Aside from the 3 month initial response, once the process was rolling it went fine, albeit a bit confusing. I did become educated on the proper terminology of NFA purview rather than SBR Registry
The new eForms page seems to work well.