From what I'm hearing, since August the keys that HB is giving as absolute freebies for 48 hours or with deadlines attached are now expiring like time-sensitive Steam keys. The ones given out as "Rewards" for stamps collected, etc, are not. I don't know if keys given out previous to the August freebies have actually expired or not, someone may have to experiment and let us know. I wonder if it is to discourage key resellers since the keys may expire before they are sold.

Easy to test. The Orwell key I donated to zeo should have been expired in this case and it was a completely free key released after August.

A little bird told me that codes for a tiny bang story from the humblebundle rewards are not valid anymore

Do you know if that includes the keys already revealed but not redeemed before they were removed, or only the unrevealed ones? (Last I heard some people thought the already revealed keys might work, but I have no way to verify.)

I read that after a point all of them were invalidated because one person got thousands? of keys through the rewards program. I managed to redeem mine btw

Ah, thanks for the info. Glad you were able to redeem your key. :)

For those interested, here is a link to what they said happened: Per Impaler26 on the Gaming deals thread -
"According to the thread at SG someone hacked HB and stole thousands of keys for The Tiny Bang Story. So they completely removed it as reward:

https://www.steamgifts.com/discussion/DMdKH/humble-bundle-summer-sale-missions-round-2-day-5-the-tiny-bang-story-removed-as-a-reward/search?page=4"

If the keys have already been revealed but not redeemed and have not been placed elsewhere they are no longer visible in the account humble bundle. (Because of the deadlines.)
But if put in any other place the key may or may not work but I can not verify.

It does not look like any of those keys were donated here from what zeo posted in the last 2 updates. There are still 2 GOG keys available for The Tiny Bang Story on The Community Giveaway - GOG Edition if someone missed out and would like the game though.

In an attempt to help out (especially since I've contributed taking the thread a bit off track here), here is a gathering of requests since zeo's last post:
[The last updated donation lists are Posts 7649 and 7692. Taken games on Posts 7680, 7694, 7700 & 7703]

***
Requests already fulfilled (listed below) -
Warhammer 40K requests fulfilled by donor due to possiblility of keys expiring. :)

*edit for clarification and separation of requests fulfilled

The humble bundle keys with such problems are Guns of Icarus Alliance, Orwell, The Tiny Bang Story, and from September 15, 2018 to 10:00 am the Pacific in Warhammer 40,000: Space Marine.

Thanks for pointing those out. :) For that particular quote I was referring to Greeklover's post on The Tiny Bang Story above (post 7756) which alerted us to the fact that HB keys for The Tiny Bang Story didn't expire, but have actually been removed/revoked - probably due to the hack which stole thousands of those keys.

As far as I know atm, for the other games you mentioned that have expiration dates, GOIA was confirmed to still work as of yesterday (post 7739), we're waiting to hear on Orwell (which is on the donated list), and there is one unrequested Warhammer 40K key left in the list. I think several of us are trying to figure out if the Company of Heroes 2 keys which were revoked upon expiration were a special case, or if it is going to become HB's new mode of operation.

You list me in there and you say, "Requests already fulfilled." I'm not sure what you mean. I have not received Braveland if that's what you mean.

Can you clarify? Thanks!

Requests above that line are still open and not fulfilled, posted first so zeo can see them. The requests already fulfilled are listed right below that line. tomyam80 editted that he had already gotten his request from another thread so to disregard his earlier request, and Wolfhunter's and kmcoolice's requests for Warhammer 40K were fulfilled by donor due to the swiftly upcoming expiration of those keys.

I have just checked both The Tiny Bang Story and Orwell keys - they were still redeemable.

Good to know. Thanks for the information! :)