While I don't have an Aura, of any flavor, if you don't want to open the case your only choices would be to try the silicone on the outside or not at all... If there is a gap between the halves of the case that you can fill with a little clear silicone it might act as a filler\buffer and keep the two pieces of plastic from rubbing on each other. Might be a bit messy. Perhaps less is more.
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