Yes, I remember discussing that detail before with someone; one can infer that the engineers stole the tech, something they ultimately could not completely understand or wield, they stole the promethean fire if you will. This should have been contextualised in the narrative ultimately I feel however, instead of being left another vague detail, deliberate or not. (Don't get me wrong though, the world building and production details in Prometheus are among its positive merits.) Yet perhaps the markedly different text inscribed on the urns compared to the cuneiform text that features prominently throughout the temple complex and their hypersleep chambers will be elaborated on in Covenant, I hope.