From the DAZ side, and I assume Poser does the same thing, if you are saving the scenes every item that goes into it will be in that scene file including the paths to it. That itself isn't terribly intuitive, but you can parse all that stuff out from there. The files are usually zipped to save space, you'll need to unzip them, but they will yield the files you actually used and what you did with them. This is of course what your program will squawk at you about if it can't find the files when you try to reload the scene.

I'd name those files by the picture and page the scene is going to go on when you are naming them. Again, I don't know how you do it in poser, but in DAZ when I am saving scenes, I can use a directory structure that maps to the comic, say comic1/page1/picture1.dsf

You might also be able to change the name of the item in the scene to match the product name, ie change the node "V4' to " "Clarise V4 By Tempesta3d" and have your scene files be self-documenting for example.