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Cleaning them, lapping them, and showing photos of them wet/dry/with slurry will help. Also, if any have chips, closeups of the chipped areas (so we can see how they broke and what layers are...

I don't know. It's going to be hard to tell until they are cleaned up. No way of telling what's beneath the surface if there is lots of crud and such.

Is that cleaned and lapped, or as you found them? Cleaning will really help.

I think the two in the boxes both look like Arkies, but can't really tell. No idea for the other two.