Since there isn't anything to 're-hide' for atheists

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That's complete nonsense. There are a huge number of religious artifacts out there. Nothing that proves the existence of an all-powerful being, of course, but lots and lots of artifacts none-the-less.

Your argument makes no sense. While there are lots of religious artifacts out there, atheist scientists have no interest in hiding them. As you said yourself, they do not prove the existence of god so why hide them? Even more they may have historical significance so not hiding them makes even more sense for a scientist.

But I can easily see a religious scientist hiding a religious artifact. For them religious artifacts may signify a proof of a deity which is great news if it is a proof for their God. But what if it is not...