Free(buy) doesn't make sense to me.... Soo I looked at it. It seems to be asking you to buy a Z-store costume pack that doesn't exist. Which is why you can't actually buy it. Also, the "free" is because there isn't a valid zen cost for the non-existent pack.
Alien Hybrid, a jetpack, and the creepy birds were lockbox rewards. I believe they've been moved to the Collector vendor, so you'll need a voucher for them instead.
There was a time, I think for 6 or 9 lockboxes, that they tried to incentivize key sales by adding freebies to people that opened each box in the set.
Open at least one of this box, that box, and the other box and you will unlock this special thing. Next series of three starts and repeat for some other special thing.
I think that I like the current way to push key sales better. The 20 key packs that contain other exclusive goodies.
Every pack may not be for everyone, but that's how it is going to be with everything they add to the game.
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My characters
As you can see, it's says I can buy it for free, but when I click the buy button I get an error message
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[at]riviania Member since Aug 2009
Open at least one of this box, that box, and the other box and you will unlock this special thing.
Next series of three starts and repeat for some other special thing.
I think that I like the current way to push key sales better.
The 20 key packs that contain other exclusive goodies.
Every pack may not be for everyone, but that's how it is going to be with everything they add to the game.