Overnight trade found corn and wheat futures in a mild retreat from yesterday’s big gains, while soybeans were quietly higher. Trading volume was rather light. China and much of Europe will celebrate their May Day holiday tomorrow through Monday. Word that Treasury Secretary Mnuchin and U.S. Trade Representative Lighthizer are expected to meet with Chinese officials in Beijing as quickly as next Tuesday generated enough hope of progress on the trade disputes to keep a bid under soybeans. However, that hope faded away during the day session as exporters reported that Chinese inspectors have begun to survey arriving cargoes of U.S. soybeans especially closely in recent days. It is reported that one soybean cargo is being held up from d...