WUZHOU—Mud-stained wallets. Bank cards. Official identity cards. Poignant reminders of 132 lives presumed lost were lined up by rescue workers scouring a remote Chinese mountainside Tuesday for the wreckage of a China Eastern flight that one day earlier inexplicably fell from the sky and burst into a huge fireball. No survivors have been found among the 123 passengers and nine crew members. Video clips posted by China’s state media show small pieces of the Boeing 737-800 plane scattered over a wide forested area, some in green fields, others in burnt-out patches with raw earth exposed after fires burned in the trees. Each piece of debris has a number next to it, the larger ones marked off by police tape. The steep, rough terrain, and the huge size of the debris field were complicating the search for the black boxes, which hold the flight data and cockpit voice recorders, state media …