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I have a similar problem, but the trader doesn't have the page key and he blocked me when i asked him for it, im not sure if i should post the screenshots here and call the trader out, or is it against the rules. I hope steam doesn't remove the games, i'll contact humble support and ask them, there can't be much more harm does, can it?
Don't worry, that useless rule doesn't apply here. Post any information you have about this guy, it's important to prevent further fraud.
Have you ever traded tf2/dota2 key for humblebundle links on this site? If so, I hope you can check your humble link now, maybe it's revoked already!
A few days ago I traded tf2 key with a Israelite and 8 hours later I found my key page missing. And he never explained why.
So I contracted humble support and they said the trader uses fraudulent creditcard/paypal to buy multi humble bundles, so all the humble links get revoked. I don't know whether steam will revoke the cdkeys I activated already, but I think it will raise the chance of account ban. Could never imagine that somebody dare to exploit chivalry!
Proof
Hope this is not a callout.
steamaprofile: http://steamcommunity.com/id/hahahahmaor/
steamtrades profile: http://www.steamtrades.com/user/maor/
I recommended everyone who get scammed give negative rep on his profile