US Mint Sells Most Physical Gold In Two Years ... and -, page-63

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"So your essentially telling me that someone bought 5 tonnes of gold (borrowed) without any sort of plan if the trade went against them, resulting in them dumping the gold at the precise time that they receive the least money for it?

I think they had a plan. Originally they were planning for the price of gold to go up and make them lots of money. But sensibly they also had a plan to limit their loses if the price went down.

"Are there people that buy and sell 5 tonnes of gold at a whim because they get tempted?"

There are big players buying a selling tonnes of gold all the time for their own reasons. It may seem like a whim to you because they don't explain themselves in public. (The big ETFs are unusual because they disclose changes in their holdings so we can tell how much they are selling and the reason why is obvious.)