I agree with snarf, he used the knife rather carefully, just to cut the pieces of tape on the top of the box. He wasn't slicing the entire box apart with it, although it did look like it at times.

That cube is ridiculous, I don't even know how I'd begin to start solving it. You can't distinguish between pieces from two different faces while it's mixed up.

People stay alive in there for months with no food or water? Nobody's scared of a rubber man that will just fall over when it comes out of the hole. Good idea, just a lame ending.