A massive amateur mistake. Not long ago, the Korean National Tax Service conducted on-site investigations on 124 tax evaders and ended up seizing assets worth about 8.1 billion KRW. Among them, one tax evader had 4 wallets for storing cryptocurrency in their drawer. When announcing the results, the officials directly published the wallet's seed phrase paper in the press release without censoring it. This led to the altcoins in the wallet being transferred out. The loss is estimated to be around $4.8 million.