In the shorter and sadder ending, I think it is likely that HarryPrime will escape, but not really care about people, and become an optimizing preservation agent of the mere planet. Thus Harry might escape the box and then start removing threats to the physical integrity of the earth's biosphere.

I'm curious just how dark Eliezer could make such an ending, if he were inspired to try as hard as possible without concern for other goals/strategy. 'Twould be an interesting read.