Yeah this issue has been around for ages. Just need to hope he sends the gold in a different non cod mail sadly (Though I've had good experience with MiracleSun sending the currency to me in this case).
Had this same issue come up today. Deducted 900 platinum from my account however the Get Attachments button remains and 270,000 gold hasn't been added.
If I had to guess as to the issue I'm thinking it removes the platinum or gold before it checks to see if you have sufficient funds, or it checks twice for some reason - maybe to do with the move we did recently not having the right validation address anymore? Anyhow it fails a check midway through the transaction and we get stuck in limbo.