Brake assembly marks ?

[NZ68RT]

I just bought a Dana 60, complete from drum to drum. It's a 1969 date coded B Body axle and has been sitting unused since 1973 at least. that's the story anyway. I know the guy I bought it from so I'm fairly sure it's true. It has 10 x 2.5 inch brakes which means it was a disc front car (I think). When I pulled the brakes off I found some grease pencil marks on the shoes, I am picking that these may be factory assembly marks, meaning a real low mile unit. Here are a couple of pics, what do you think?

Steve