As I was looking around on the CADL photo archive for civil defense photos, I found this picture of what I think is Big Bertha at the capital being tested and worked on. I do know that Lansing originally had a Chrysler siren on the old Ottawa power plant (now the AF Group) before it was replaced by the Thunderbolts around 1963. The photo was taken in 1943, and Big Bertha was made in 1942, so it could be possible it is another picture of it!
Known photo of Big Bertha:

Photo from the archive: You can tell it's probably it by the horns. They're both in a hexagonal shape, but one is from the other angle. the back even looks the same! Is it actually possible that Lansing actually had Big Bertha instead of a Victory bell?
EDIT: If you want to know where it's from, here's the link: https://cadl.catalogaccess.com/archives/5875