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If you look at hofftari's original case that I remixed (https://www.thingiverse.com/thing:1325370), He lists:
4x M3x16 screws for the case
2x M3x8 screws for attaching the case to the frame.

The MK2S has two tapped holes there which I believe are for the multiplexer board for the multi-material upgrade but they work great for mounting the Raspi.

Raspberry Pi case for Prusa i3 / i3 Mk2