I wouldn't put it past the copyright cartels in the US to find some way to bend copyright law to go after people bringing copies of books into the US, even just

I wouldn't put it past the copyright cartels in the US to find some way to bend copyright law to go after people bringing copies of books into the US, even just for personal use, that were obtained in a manner that would be considered illegal in the US. On the other hand, in this particular case, I don't see how the "offender" would ever even get on the cartels' radar for the act of bringing a Kindle (in personal luggage) loaded with books under copyright in the US and in the public domain elsewhere across international borders.