The three things that matter in photography of edges

[Cyrano]

Mike,

Here's what I have so far for photography of your rolled-edge samples.

I labelled your samples A, B, and C, with five inspection sites per sample:



Here are shallow-depth-of-field side views of all sites, with focus on the edge apex. The top row = sample A, middle row = sample B, and bottom row = sample C. In each row, sites 1 to 5 are presented in order, with site 1 at the left and site 5 at the right: 



I found sample B to be of the most interest, as the rough texture everywhere on samples A and C made edge details less conspicuous. 

For sample B, here are focus-stacked images of the sites seen from the side and seen from above:

Sample B, site 1:



Sample B, site 2:



Sample B, site 3:



Sample B, site 4:



Sample B, site 5: