I've seen indents like that on my own brass after a newbie was a little hamfisted when loading up a magazine prior to shooting. Instead of placing the next round quite flat on top of the previous round, they were forcing the base of the next round onto the side of the previous round in order to push it into the magazine.
(Did I describe that well enough to understand?)
Of course it could just be dented as the result of another round being dropped on top of it during handling.
Or... I could just be fullashit and way off the mark.
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