I doubt if the admin will take ETH address to consideration however you can try signing a message with any of the ETH address you have used before.

You need to make sure the hacker do not delete those ETH address. Get the link of the ETH addresses and let someone else (I can do it too if I see it) to quote them so that the hacker can not change it.

I will update this post with the instruction of how to sign an ETH address (MEW) - if you need to know the how.

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