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I would think checking for a sanded stock ( no star ) and it looking primo would be a good start. If it still has not been sanded what's the chance it was issued? Not sure just a guess tho.
Yes , checking all the cartouches helps prove it wasn't refurbed but what I was trying to determine is how to prove it wasn't issued/ fired, besides of course proof firing! I think it would be very difficult, all you have is condition of the receiver/ bore!