Wow, that's incredibly worrisome. Never had that happen, thankfully.
I did have an issue (not for a currency item) with their "International Shipping Program" where my order was returned to the sender as "undeliverable" even though it never left the US. I was refunded by the seller for the item but not for the shipping (which was over $300 USD). After weeks of back-and-forth with both the seller and eBay I was told by both to pound sand.
I definitely recommend avoiding anything shipped through that service (unless it's some low-value item that you don't mind losing).