I wasn't even able to send anything from abroad to my colleagues in Vietnam. We make electronics + firmware + backend API's and he needed a few Samsung phones + electronics to test; you can only ship new phones sealed in boxes there and electronics need bucket loads of paperwork and then pay $. Never had that issue with China, but it's 2+ years ago since I last had to ship anything there though.

Is worth mentioning regarding Argentina and this HN submission in particular that the government is aiming to provide a laptop to every secondary student, they are build (assembled is probably more accurate) in Argentina and they come with a Linux distribution maintained by them called Huayra. I think that is pretty awesome for such a poor country. Customs in general are annoying, I was arriving to Germany from the US with a new MacBook, I was stopped and they ask me where did I buy the computer, I had bought in Germany, so they say it was fine, they told me to send a copy of the invoice to them, which I did. They were just making sure I paid the taxes there. From what I heard from Argentineans bribing is very common, but they somehow think people taking the bribes are the only corrupt but not people bribing, or avoiding taxes.

Was the case for me when I flew back to Germany with my music instruments. They would not listen to any reason but forced me to pay to get the instruments that are my property back. Thieves.