Step 1: Your Nexus 10 box
Look at it.
Revel in it.
This is your box, there are many like it, but this one is yours.
Step 2: Open It...
Unless you happened to be named Pandora.
Then don't ever open your box.
BAD THINGS HAPPEN.
Step 3: The Base
We'll be using the lid of the box as our base, as everything else will fit IN the box.
Step 6: Insert
This will act as a spacer for the other half of the box to prevent it from sliding too far forward and falling into the lid.
Step 7: Remove Insert
Take the OTHER insert out of the main box.
Put it aside, we won't be needing it.
It has no purpose here.
Use it for another project.
Or burn it.
Step 8: Oh, And Those Too
We don't need those either.
Step 9: Flip It. Stick It.
The lip closest to you (of the flipped box) should sit inside the insert's front gap.
The insert should prevent the box from sliding all the way forward.
Step 10: Little Help From A Little Friend
Squish it flat.
Step 11: Last Bit
It will stick up from the base and this will act as the catch from the bottom edge of your tablet.