This is a case for the FloppyEmu accessory "Noisy Disk Mechanical Sounder" for the Apple II, Apple Iic and Macintosh. (https://shop.bigmessowires.com/products/noisy-disk).

To put together, slide the cables through the side holes, and insert into the Noisy Disk. Stick the Noisy Disk into the case, and snap the top on. it should fit very snugly - my print has enough friction to keep the top on easily without adhesive.