Freezing shelf stable boxed liquids?

This seems like something I should know, but don't.

I have 3 or 4 boxes of Costco boxed chicken stock left, bought for those times I don't have my own. I noticed today they have expiration (best by) dates of just about a month forward now. Rather than make soup and freeze that since its not really soup weather (more like grilling), is there any reason I couldn't just put the unopened boxes into my freezer? Will they destruct, implode or something?

I know its not a problem of great expense, but I would like to keep them easiest possible way and less trouble than asking around if anyone needs them....Thanks so much!

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