A little late to the party on this thread, but I'm a big Kellogg's collector. I have a complete NM no-crack run of all the baseball sets and nearing completion on second sets for several years. Also have a NM '70 FB set and six cards away from a crack free '71 football set. I cold go on and on about Kellogg's, but the one thing I will add is that yes, a consistent environment is important, but if it has been flat for years, it will be fine. If it has been curled and then you try to store it flat it will most likely crack. I believe a lot of the ones that are graded and then crack most likely had some degree of curl prior to slabbing.
Love me some Kellogg's, fun to see this thread.
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