one quick question having a coin graded prevent 100% of fake right?
I've only one coin non graded and I'm a bit suspicious It can be a fake, because it's not and it's in relatively bad shape

I would've thought their job is solely to put a wee score on the lump of metal placed in front of them. I presume grading and authentication are totally different areas and not a problem the average grader is looking to take on. Could be massively wrong though.