This insect is readily identified by its two-toned (tan and copper colored) wing pattern. It feeds on dried fruits, nuts, chocolate, powdered milk, bird seed, dog food, and a variety of grain products. Full-grown larvae are pale and cream-colored and are usually about 13 mm long (range 9-19 mm), see the attached photo.
Thank you all for the answers and identification. My specimens are a little discolored so I was not sure about the species, but you have already confirmed me.
I already entered my answer and it is Plodia interpunctella (Hubner). I know this insect in 1992 when I did my M.Sc thesis on stored maize grain insect pest. It was one of the many insects I recorded on maize grain in Ethiopia. It is a secondary pest meaning it the larvae can only feed on damaged grain either by primary pests like Sitophilus spp, lesser grain borer, larger grain borer, Angoumois grain moth, etc. or on mechanically damaged grain.
In our case, Plodia interpunctella feeds in coffee beans damaged by coffee berry borer Hypothenemus hampei. Also in maize grain damaged by Square-necked Grain Beetle Cathartus quadricollis