I believe we will see this happen more and more often as countries realize how vital is to store gold within their borders.
In times never before so uncertain with big voices talking about going back to the gold standard, smart countries and smart individuals should, in my view, accrue as many bullion and coins they can afford.
Adding to your post, not many know that the 3rd country with the greatest gold reserve is Italy with 2451 tons. Unfortunately part of it is stored in the US.
Speaking of which I remember reading that the majority of America's reserves have been sold, but it could be untrue.