[BAReF00t]

Well, if we found it, it would already be contained unless accessed by definition.

Also, magnetic fields could definitely contain it, as is already done.

We can already make anti-matter, as it't essentially the process of making matter bounce off, using a photon, in such a way that it reverts its time direction. Or, in classical view: Turn a photon into a particle/antiparticle pair. The problem is, of course, that it first takes those shitloads of energy, that it would release later.

And to actually find anti-matter in nature, you would most likely have to turn into anti-matter yourself, travel back in time, and somehow survive the big bang without touching anything, to come out the hypothetized other side where time is reversed and anti-matter expanded to. Or try to get inside a black hole, and revert your direction of motion (as time and space are reversed in there). Both not yet technically available, to say the least. ;)