KVP's aren't correct.
Make sure your boxes are numbered 0 to 10. Select box that doesn't work and determine which number it should be, rightclick>enter prefab.
Move the camera inside the clip, right click on the struct >select "script_stuct"
under script_noteworthy the value should be: chest_# (ex. chest_1)
Now right click on the struct> select "zbarrier_zmcore_MagicBox"
This is where I messed up when editting the box:
under script_noteworthy make sure the value is: "chest_#_zbarrier" (ex. chest_1_zbarrier)
I mistakenly copied "chest_1" and pasted it into the other struct which is not correct as the two values are not identical.
The first one is just chest_# and the other is chest_#_zbarrier.
I used this tutorial:
http://www.youtube.com/watch?v=78Dr_Dz7GvIHope that fixes your problem.