Just a little counterpoint here...
In the USA, many mandolins are imported from Japan, Korea and China. It isn't at all unusual for a mandolin to arrive with setup issues due to geographic environmental differences (mostly humidity and/or temperature) and due to travel stress. As such, I wouldn't be at all surprised to see the same thing happen with instruments coming to Asia from the USA.
Probably the most expected relatively minor setup problems would be neck issues like high or loose frets and neck relief problems. More serious -- and really quite rare -- problems could be neck warping or top sinking, or perhaps some areas of seam separation. Travel damage is also possible, the most common being endpin related endblock cracks or broken peghead scrolls That said, I'd be very surprised if you encounter any serious problems at all, most likely there will be nothing that could not be addressed by a thorough setup.
As has been mentioned, there is a
good setup tutorial available from Rob Meldrum. Also, if you are buying a new instrument, I'd recommend talking to the builder or supplier about how to deal with any serious problems that might be covered by warranty.
Good luck with this... I suspect and hope that you'll receive a wonderful mandolin that is at most only in need of a good setup.
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