The steps to open the boxes aren't random, but the items inside are. But from experience with the box and seeing people posting what they've got from each box, I can assume what kind of item you'll get from each box.
ViviĀ“s (the Schlechter one XDU) notes: the system works like this, you buy the Trickbox, it gives you randomly one of the boxes, thats the random part, this is not a level RIG, its a click and see one =P

2-3-2
Cheap items

1-2-4-2-3
Average items

2-4-3-2-1-1-4-4
Random Valuable items
and evolve if you're lucky in

No number, Shake the box
If you're lucky... Really good items[/