paladin181: I've had at least 2 disappear from my keys library over there. I found out as I was doing my giveaway. So it could be happening...
It tracks with a lot of screwiness people have reported with it. Sometimes people don't see the key boxes at all, sometimes people see the key boxes but nothing's propagated into them. Not to mention the reports of people just simply getting hosed on keys for titles in things like the previous Monthly bundles which didn't include them initially (mostly related to the Humble Originals that later got picked up on Steam like Ethereal and Macdows 95 but not limited to just those apparently).
Ever since Valve had to put the boot to the throats of scuzzbucket developers and publishers abusing things like their trading card system via flooding the market with keys to games they had a hand in (whether it was by giveaway, stupidly cheap bundles or just third-party authorized sellers doing "get this game for peanuts" style discounts) it's seemingly turned off the key faucet for the ones doing things through acceptable and less sleazy avenues and the result is to the similar tune of "Well, thanks a lot Humble/IGN - I didn't need a key for something
I paid you for, now I wonder if I should consider legal action?"
My personal experience with this thus far was when I bought a Steam key for the first Mafia via Humble Store (I would've bought it here on GOG, but I'm abysmally cheap and not flush with money so I go for the deals when I see them and have the money to spend). Apparently I wasn't alone at the time in thinking "dang, this is a pretty decent deal" because by the time I paid for the order and went to look at the key page I saw the "Keys for this product are temporarily unavailable. We're working on getting more as soon as we can!" placeholder message and it took just shy of 3 days before a key was actually where it was supposed to be. I'd hate to be the people who've seen that damn message for weeks, if not months or more in the hopes that a key would actually materialize at some point.
Of course, it'd cut back on a lot of disappointment and emails flooding their support staff if they'd take hours out of a few days to have someone code up a notification system for customers to know when keys are added to games in bundles that previously didn't have them so those customers who do happen to care about that sort of thing can act accordingly in a more timely fashion.