I suspect it was exactly a function of improper storage (and that it would last forever in a cool dry place). My broader point, I guess, is that the appropriat

I suspect it was exactly a function of improper storage (and that it would last forever in a cool dry place). My broader point, I guess, is that the appropriate date to sell something by depends so heavily on factors unknowable at production time that it’s hard to guess. But also that apparently-shelf-stable goods can in fact degrade. And I guess that it’s kind of weird and unnatural the way modern industrial packaging/processing have trained us to expect that a given product should be interchangeable with any other until an arbitrary date.