h.nwosu, post #7: Picking up post #4: that is the part I would want checked first. The honest answer on Cross-border purchase within is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter. Most people get the first two right and then argue about the fourth.
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Building on post #35 rather than restating it.
Temperature-controlled material and long-haul travel is a practical problem with practical solutions, none of which are on the packaging.
The number is defensible. The precision I gave it is not.