I put a little tuna in the can, left it over night and bingo.
Step 16: The breakdown and optional handle
You can see here that the entire thing breaks down and fits inside the box. I also used an old piece of webbing to make a handle for easy carrying. This is recommended especially if you plan on transporting the animal you catch (the box isn't very heavy empty, but with a raccoon in it may be a different story), but isn't required for the trap to function.