That e-mail is a HOAX...Confirmed by Susan Daniels, the private investigator who first flushed out the phony SSN.
The US Govt. has never accepted PO Boxes as legal addresses for obtaining any kind if ID, personal or professional. Before rural addresses were assigned street numbers for emergency purposes, the only box numbers that were legitimate addresses were RR Box numbers. I know this because we were in business at the time & living & running the business from the rural location, our number was RR Box 127, then we moved & we became RR Box 195, some 13 years we moved back to the family farm where we were RR Box 127 again. We now have had an official street location for almost 10 years with an official govt sign in the ditch right next to our drive with the our address number permanently affixed to it. I say official govt address sign because it was the government who put it there. We had no say in it. I guess our HUGE mailbox with the numbers affixed to it on both sides was not enough proof for them that the number we had on the box was legit.
Yes I had the same type address changeover in Indiana.
We used to be RR 1 Box 287K
Now it’s a “regular” street address, changed in the 1990s IIRC.
Supposedly for better 911 efficiency, which makes sense.