The reward values for Silver Coin and Gold Coin are incorrect in openBox().
The values for the Silver Coin and Gold Coin rewards in openBox() do not match the intended value specified in the constructor. Here the values for each coin are twice the amount originally declared.
This will result in users that win either coin leaving with twice the value for each than was originally intended.
Manual Review
When pushing a reward to rewardsOwned() reference it from rewardPool() by reading the index of the respective reward.
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