Just the little details as you mentioned, dings etc. on the grips and stuff as far as the Mauser goes. 'Pat's Patch'..^^.. has gotta be there too!..my find had a funny name, thus so should his, haha
It's a real shame we can't see the rear of the Mauser though. Not just for the serial(s), but even the SN stamp varies in shape and depth as well as alignment of any and all markings stamped in anywhere.
The original flash hider is something to look carefully at, especially at the front-most radius size and transition to the cone, there's some (hand machined) uniqueness there too.
OdiWan72 has the closest Real FH variation to the Hero's FH that I've ever seen, barring many similarities to the original..lucky ducky
I'll see soon if I can get a decent photo of the proof-marks from my C96 as mentioned. Mine was pretty well damaged by a small house fire a few months ago, so I can't guarantee it's very legible.
-Carson