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What could have caused them or any die dent?
I suppose it could be nearly anything that is in the general vicinity of the die that was damaged. Something hard enough to create damage to the die by being dropped on it and suppose the die itself could be dropped onto something else too, to create the dent. Yours may have had bouncing involved, to create the multiple dents.
Maybe Mike Diamond will chime in to explain it beyond what he has already done on Error Ref.
-makecents-