"It did not give any details on which countries these could be, but banks that do not regularly publish information about their gold stockpiles include those of China and Russia..."
https://www.reuters.com/markets/commodities/record-central-bank-buying-lifts-global-gold-demand-wgc-says-2022-11-01/
https://twitter.com/GoldTelegraph_/status/1587444108838174725?s=20&t=4m5HsHRmaZSv7s4lLTvxO
Record central bank buying lifts global gold demand, WGC says | Reuters
Central banks bought a record 399 tonnes of gold worth around $20 billion in the third quarter of 2022, helping to lift global demand for the metal, the World Gold Council (WGC) said on Tuesday.
https://www.reuters.com/markets/commodities/record-central-bank-buying-lifts-global-gold-demand-wgc-says-2022-11-01/