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In response Kim Runner to her Publication

"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