The black coating takes longer to break in and even if you're the third owner it's hard to tell if the previous owners used it or broke it in. Some people buy knives and put them in a drawer. The coating is either cerakote or teflon and the detent ball needs to wear a nice groove into the blade. The squeaking is probably the ball rubbing on some rough spots on the blade. Over time it will smooth out and the squeak will go away. Glad we are taking care of you either way.