I design the above paperback cover for publishers, Beautiful Books in 2008. I had the bitten corner effect die cut, and was rather pleased with the result.
That is until I was in Daunt Books yesterday and spotted this on one of their tables...
Similarity in thinking. It was designed by Paul Belford, for Headless Chicken Books in 2014. He has managed to create a far more convincing chewed corner than I had. It must have been done by hand, using some kind of horrifically violent machine, as each one is slightly different. It is a delightful cover.