Recorded in a manner which lets us know about it today, which even includes things like talking to people about it. As we lack evidence for a prior example, it's pretty safe to assume that it didn't exist, and even if it had existed, it wouldn't affect us anyway because we don't know about it.
People in general, I presume.
It's because, when you're talking about changing energy into mass and vice versa, the equation in question is (delta)E = (delta)mc^2.
No such equation exists for mass and volume; E=mc^2 doesn't mean that mass can be changed into energy per se, just like volume = mass / density doesnt' mean that volume can be changed into mass.
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