"You have it backwards. If you want to say that Boone and Fritz saw the receiver inscription and the bare metal where the crest was ground off, then you need to show that they saw such things."
You got it wrong. I'm not claiming they found/saw a Argentine Mauser. The Argentine Mauser is only interjected into the conversation because it's the 7.65 Mauser that looks the most like the Carcano. Legitimizes the concept of misidentification.
My point is if, as WC apologists contend, Boone and Weitzman mistook the Carcano for a Argentine Mauser they would need to have been familiar enough with it to mistake one for the other. If they were the 2 prominent identifying characteristics, the ground off Argentine National Crest and the receiver inscriptions would have been mentioned in their affidavits and investigation reports.
IMO The '91 Argentine 7.65 Mauser is a smoke screen. Part of the cover-up. A sleight of hand trick. Make one Mauser appear and
another disappear.
1.)
The prominent identifying characteristic on a model 89/90/91 is the magazine. If you've studied enough, you can pick out one on these rifles from 50 feet away based solely on magazine.
2.) Accurate identification using the magazine requires a certain level of knowledge of the model 89/90/91, as well as a certain level of knowledge of the design of other single-stack magazine rifles.
3.) If you have some knowledge, but not enough, you're prone to making mistakes.
4.) The rifle that most resembles the Carcano isn't a Mauser '91, it's a Gew88, which isn't a coincidence, BTW. OK, maybe a Mannlicher M1893.