Some TF-2 Questions

I am using the street setup for my A727 trans. I had 1 small check ball fall out.
There are only 2 places that ball could have come from. Location R or Location C
Based on any expertise and the way the plate and seperator are, which is the probable location. I am thinking "C" as there is an ever so tiny scuff in that location Any insight would be greatly appreciated. I believe trans is late 76
IMG_2456.jpg IMG_2456.jpg IMG_2458.jpg IMG_2459.jpg IMG_2460.jpg IMG_2461.jpg IMG_2457.jpg