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I keep Reese’s peanut butter cup minis in the freezer when family sends them (not for sale in Japan currently). My wife likes Alfort which are chocolate + biscuit cookies and turned me on to putting those in the freezer. Somehow, it’s much better that way; I didn’t expect the biscuit to be changed or, if so, certainly not better, but it is.
It will eventually go rancid. More oxygen getting to it and more heat will speed that up.