Wow, I wonder what a metal analysis would find for that. I would be willing to bet it's not very well treated.
Looks like a lot of the grease flung away from the worm gear. Is it dry around the worm gear area as if the grease went away? I'm surprised that they didn't allow the gear oil from the t-case to splash into the unit and use that as lubrication instead.
It will be interesting to see what the used one looks like that I ordered too. Sounds like that is your t-case issue which needs to be addressed. Luckily that is something which can be easily removed if a modification were to be made.