Perhaps mine were toughened for international transit - I never had a broken one in any of my orders. A few missing, but that was in the era of 'the missing Zotz mystery' - I recall Nanny being most displeased!
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I've been fairly lucky so far...although I may be pushing my luck now with Nick and his handcuff picture...a lot of mine don't have all the fizz I'd like. Like they've been deflated without being crushed...