Maybe the guy, who made them had an easy source of azurite and malachite right in front of his door ? It is easy to mix these minerals with charcoal to a ball and surround them with clay. Putting them in a fire will produce copper-nuggets. These blue and green minerals are easily to identify and metal/iron was expensive. So maybe just a cheap source. For training arrows copper/bronze will be enough to shoot on hay targets. Till the 18 th century there was a law in england to train bowshooting minimum once in a week. So it was very common to have competitions on sunday. If these bronze-pieces were easy to produce for that guy....why not.
Just a different thought
Best Thomas
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