BeatriceElysia: I guess that means my key was stolen as well - or not? How this works?
Accprding to a post on SG, if you revealed tthe ley; i think yours is still valid, but who knows if its the case. Only way is to either contact support or give the key to someone who don't have it (to try to redeem it) => in the case you have already the game on your account.
Personally i always reveal keys (even for trade / gift)
zlaywal: Ugh, this is bad news. I've managed to redeem my key instantly last night (my time) and it still available on my steam library. But who knows if the developer and steam revoke it. And In worst scenario, humble will not offer this kind of deal when you only have to visit the store daily anymore.
Depends the dev and / or steam, if there were xxxx amount of keys, it's possible keys won't be remplaced (invalidated it's almost certain), maybe they could offer another game instead....well i don't know. Usually keys stolen or whatever in this case are invalidated, but since it's a reward , could be very different. I think the course of action is to contact HB's support (but during sales they are very busy + if you add this issue..).