@coldtoast German version is debossed (apparently even the 3D logo) and has the same finish as Filmarena's version. Just the additional (but debossed) 3D logo in the title differs.
They have available long time now they have removable cover on the back that's adhesive to attach to a disc insertJust looking through my copy of this and I noticed the spindle for holding the second disc is unusual to me.
It looks like it was just added to a standard one disc Steelbook and it's just kind of stuck on by some sort of adhesive?
These would be very useful if adding an extra disc to a steelbook without having to replace the whole plastic insert. Not sure if they can be bought seperately though?
They have available long time now
They come in packs 10/20/50 and more
Seen websites list them before
I will find out later this weekend were you can purchase them and will let you know