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So they mail the non-U.S. ones first. That's a nice touch....
There is no reason why they should mail the US ones first.
That said, the first "check has arrived" reporting day usually has both US and non-US countries reporting, it just happens that someone in the UK starts the day earlier than someone in the US ;) Last month, the first check sighting day included those from the UK, Canada & the US.
Jenstar, I wasn't saying they shouldn't mail non-US ones first. But if the checks arrive on the same day in the US and in other countries that says to me that they DO mail the non-US ones first, so that they won't arrive later.
Are you assuming they are all mailed from the U.S., or are you assuming the USPS is faster than every other postal service in the world when mailed locally?
(I'm certainly not assuming that the USPS is faster than every other mail service in the world when posted locally. In my personal experience it's somewhere in the middle--the UK is faster, Italy slower.)