It may be that my German lessons has been a long time, but one case, which is named and offered with the simple term "leather case" is the term for leather. Also for not originating from the leather experts customer is however apparent that this case is not made of leather. Maybe I missed it, read the terms and conditions that "leather" is merely a non-binding attribute, such as in the way we have to bear in goods from the food industry for many years: "nature-identical", "Natural", "All Natural" , ..., bla bla bla
And to make matters worse is the seam on the sewn-together of two-smelling synthetic solvents halves "leather case" at a corner simply run out of the contour of the "Leather Case" without the someone had disturbed. A hole is at the respective corner therefore simply left.