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What I am curious about re the Swiss referendum is whether the Swiss will be forced to buy 1500 tonnes as I believe they will have to do should it pass.  1500 tonnes is lot of gold (48,225,000 oz).

FOFOA has mentioned that it is hard to buy more than, say, 100 tonnes of physical at once.  Even for a Central Bank, buying large amounts of physical is hard.  And look how much trouble Germany is having getting gold back from the FRBNY...

But, if Switzerland were to "buy" their gold via the vaults of the BIS, and NOT demand that the gold leave the BIS, then maybe buying the 1500 tonnes would be more like buying "paper gold" rather than the physical.  The BIS is in Switzerland (Basle) though, so perhaps that might count as gold stored "in Switzerland".