It looks like when I use the PostTextFiles stanzta in the A46 June 11 build it doesn't put the Origin line.
--- Mystic BBS v1.12 A46 (Windows/32)
* Origin: (1:229/664)
You are right it was not bring in the "default" origin line when no origin was set specifically for that base.
I've fixed it and it will be fixed in the next build.
Thanks!
--- Mystic BBS v1.12 A46 2020/06/11 (Windows/64)
* Origin: Sector 7 | Mystic WHQ (1:129/215)