Sometimes you really think you have looked EVERYWHERE!! I have had the same trouble! But the items ARE there if you have not left the area for too long (no more than 2 sleep periods to be safe, though longer is usually ok). You need to move your cursor VERY SLOWLY in all the dark areas behind walls/scenery in the location where he died and make sure you cover every darn pixel. It has sometimes taken me AGES AND AGES to find dropped stuff, grrr!
Desuma_Malevois suggestion of turning up the brightness is a good one
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