Navigate to the ZenChests contract [https://etherscan.io/address/0x7b70695e761eb828abed8c4d506f9af3a76ef4b5#code](https://etherscan.io/address/0x7b70695e761eb828abed8c4d506f9af3a76ef4b5#code)
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Click "Read Contract"
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Click "13. freeClaimUsed"
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Input the ID of the 333 Club Pass you want to check the claim status of, then click "Query"
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Check the Response below. True means that the claim has already been used.
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Here's an example of a 333 Club Pass that hasn't claimed yet. At the time of this screenshot, Token ID 153 has not claimed their ZenChests, so the response is False.