[tylerdurden]

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All that is really required is first occupation, i.e. homesteading.

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You can't homestead without investing labor.

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If I pocket a rock while in Antarctica, I haven't "mixed any labor" with it, yet I still own it.

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Possession of objects (as opposed to land) requires labor - transport, maintenance, etc.

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If I "mix my labor" with lumber stolen from my neighbor's land to fashion a chair, I don't own it.

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Right. I specified that the materials must be unowned (of course, in the case where you add your labor to materials you already own, the product is unambiguously your property).