(Bloomberg) -- A giant state-owned Chinese commodities trader is nursing losses after a shipment of copper from Russia worth nearly $20 million went missing, reigniting fears over fraud in the often secretive market for buying and selling raw materials.Most Read from BloombergHunter Biden Was Convicted. His Dad’s Reaction Was Remarkable.Apple to ‘Pay’ OpenAI for ChatGPT Through Distribution, Not CashUS Inflation Broadly Cools in Encouraging Sign for Fed OfficialsFed Officials Dial Back Rate Fore