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Try to redeem the key, and it will tell you on Steam if it has been redeemed already
If it has, you can choose to send an email to the account it was redeemed on.
If it sends an email to your account, then you can use that as proof that you own it, and you can contact Steam Support.
Or, if it sends you an email and it is for another account, then that will be an answer too.
He may have bought it back when Humble gave Steam Keys, not just auto redeemed keys.
https://www.humblebundle.com/
Login
Then click on your account name in the upper right and go to "My Library"
https://www.humblebundle.com/home