I haven't done a lot of shipping outside the US, but what I've done...Siberia, Australia, UK, Ireland, Norway...have gotten to where they were supposed to go. On the other hand, I've had many, many coins sent to me from the UK and Ireland. and a few from Spain. While a bit slow at times, especially now, I've eventually received everything with only one exception. Several years ago a coin coming from the UK disappeared somewhere and never wandered into my neighborhood. It wasn't tracked so I'm not sure what happened to it. Although a nice coin, the eBay seller refunded my money promptly so it ended well. Being the eternal optimist that I am, I still expect it to arrive any day now. I'm sure it will be here tomorrow.

One thing that I noticed was that items coming from the UK generally take about ten days...five or six to enter the country and about four more being driven around the country by the US Postal Service. On the other hand, items coming from Ireland take about half the time. I suppose the difference has to do with the regulations or practices of each country's postal system. In any case, as long as I receive everything, I'm happy.
Bruce