Christ Almighty, Richard, what a bloody frustrating time you've had of it. What with non receipt, wading through the robots you have to deal with subsequently, and then finding the coin had gone to somebody dishonest. It's enough to put you off trading abroad for life.
I'd certainly never buy or sell anything from/to Italy - that's a cert, given their reputation. Nor the other places you mention. Although so far I've been lucky in buying coins from the USA, and two from Australia, which have always duly arrived without having been opened.