This is a display case for a WeAct 2.9" E-Ink display:

The case has enough space for an ESP32 controller, cabels and other electronics. All around there are plenty of vents to keep the components cool and on the back there is a hole suitable for a micro-USB or USB-C cable to power the controller and a bigger hole for other stuff to route outside (on the pictures it is used as a thermometer display, and the thermometer part is moved outside of the case to improve accuracy).

The parts fit on an A1 Mini plate and the top just snaps on the bottom part of the shell. For later servicing it can be removed easily.