both Dead Island are not available in ZENSURLAND (germany)
but they actually show up as redeem or gift
SAINTS ROW III does NOT activate too
So I guess that means they got some kind of trouble when they included the first "Dead Island" NOT regionally restricted in an earlier Humble Bundle (May 2014). Gladly I bought it then and thus completed the game uncensored. :-) And I guess "Riptide" isn't that great anyway (according to the reviews) ...
yeah I think someone in Germany didn't like that eheh
actually I let a friend of mine in Italy activate saints row 3 with my account and it worked!
if you're interested in Riptide you can do the same if you have some trusted friends outside Germany, I had both dead island and loved them both, Riptide works great on Linux with Wine
so what's not redeemable can be sent as gift outside germany!