Sorry, no inside pictures but I do have, I think, pictures of the inside of the hide. I'll check. I assure you, there was two healed cuts between the ribs on both sides.
We don't all have to agree.
I know that two deer that I have harvested have had arrows pass through their chest cavity earlier in the same season that I shot them. They both looked completely normal coming in and they both died when hit in the right place.
Just like I don't believe bucks become completely nocturnal, we all don't agree with the void.

Maybe it isn't a void at all. Maybe there is a "place" filled with something other than lung tissue, arteries, and such.
Greg