I wouldn't think Ben is too bothered about keeping within any laws, so he wouldn't need any paperwork. Also, he'd have to come up with some pretty good excuse to legally dig up a few hundred bodies. The 'fake' plane is at a too inaccesible place to make recovery of any of the bodies financially viable, so DNA testing can be ruled out I think. What I don't get though is that surley all the dug up bodies would need to be more or less 'fresh' or people might think it a bit strange regarding the different rates of decomposition of the bodies.

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