Who are the mystery buyers responsible for central bank gold boom?

Central banks bought a record amount of gold last quarter as they diversified foreign-currency reserves, with a large chunk of the purchases coming from as-yet unknown buyers.
 

Almost 400 tons were scooped up by central banks in the third quarter, more than quadruple the amount a year earlier, according to the World Gold Council. That takes the total so far this year to the highest since 1967, when the dollar was still backed by the metal.

Bullion prices have been pressured this year by aggressive US interest-rate hikes as the Federal Reserve tackles soaring inflation, which have prompted exchange-traded fund