I'm not. We already know that a Madusa spider can paralize you for 8 hours. I think we can assume that we saw the whole buried alive thing to set up Patchy's return. They showed us you can fake a death. Otherwise what was the point of N and P"s death.
We know the Others had contact with the outside word for a while. They could have sent word to the mainland, to have them release the news that flight 815 crashed and there were no survivors. That way no one would look for them.
Granted, not as cool as The twilight zone but, very possible.

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Hope is a very dangerous thing to lose. - Sayid

I do what my Rice Krispies tell me to. - Anonymous