But the information in either box is clearly an influence on the universe - you can't just create information. I'm operating under the assumption that Omega's boxes don't violate the entropy principles here, and it just seems virtually impossible to construct a mind such that Omega could not possibly, with sufficient data on the universe, construct a truth and a falsehood for which when learned by you would arrive at causal disruption of the world in the worst-possible-by-your-utility-function and best-possible-by-your-utility-function manners respectively.

As such, since Omega is saying the truth and Omega has fully optimized these two boxes among a potentially-infinite space of facts correlating to a potentially-infinite (unverified) space of causal influences on the world depending on your mind. To me, it seems >99% likely that opening the white box will result in the worst possible universe for the vast majority of mindspace, and the black box in the best possible universe for the vast majority of mindspace.

I can conceive of minds that would circumvent this, but these are not even remotely close to anything I would consider capable of discussing with Omega (e.g. a mind that consists entirely of "+1 utilon on picking Omega's White Box, -9999 utilon on any other choice" and nothing else), and I infer all of those minds to be irrelevant to the discussion at hand since all such minds I can imagine currently are.