Has the existence of the Higgs Boson been verified?

Nope, not yet. The problem is that these supercolliders produce massive amounts of data, and the scientists have to prove that what's observed isn't just by random chance. So what they're seeing here is something that looks like what was predicted, but that isn't strong enough evidence to verify it. Either way, a lot of theories are going to be either proven or disproven over the next two years based on what happens at CERN.

As of yet; no. The reason that it has not been identified is that it exists outside of the atom. The Standard Theory is incorrect in that it assumes that the total energy of a particle must exist inside of the component parts within the particle. In fact, the Higgs Boson is a part of the vast field of energy variously called "aether" or "dark energy", which is a kind of cosmic background and energetic field that "squishes" everything together. It also acts as the lattice on which many types of photons and rays travel upon.

No, not at the present time. However, the scientists at the large particle accelerators are working hard to try and find it.

No.