https://smashmockup.com/psd-slipcase-book-mockup/

This is a free slipcase book mockup with its dust jacket to showcase any print designs. Easily add your own graphics thanks to the smart object layers.

This fully layered PSD file allows you to show off your design. The PSD file allows you to change all elements and come with many customization options. Completely layered file with smart object.