I'm not 100% sure, but I think it was some original fancy pantsy packaging from ordering from the site.
The only unknown variants I know of is the original volume's #4 thinner and slightly different SDCC Slipcase Edition, A creaseless #1 DF variant(Cheryl ), the Head Games printing error #4 SDCC slipcase variant and the blue tinted Crown of Shadows regular reprinting to fill orders of the original lost shipment.
I heard there was a DF foil variant of Head Games #1, but it never surfaced. I lie awake at night on my bed watching my fan like Martin Sheen in Apocalypse Now, waiting for one to appear.