It is common for people to rent a mailbox to make them harder to find so there's no inconsistency with that. They would use a mailbox to keep their anonymity/privacy as activists.

Also, these leftist types often take on made up names that that they are known by in their circles in the organizations. It makes sense for them to have an activist pseudonym.

It might have been a scam but the name and location are not evidence of it being a scam. This was back in 2022 during the "Summer of Rage". Searches now might not turn up much, especially if they wanted to cover their tracks.