I've got one of my Raspberry Pi 4 cases for sale on e-bay :
https://www.ebay.co.uk/itm/153584782024 ... 1555.l2649.
FYI - I've changed this to an auction style sale starting @ £4.95.
It's been used once to take the photograph for e-bay (two of the pieces have had their protective film removed, but the other 4 pieces still have their film on) and comes with all the bolt/screws required.
This case has room for a 40mm x 10mm cooling fan to keep your Pi 4 cool.
Also got some 3d printed cases for the Pi 4 which were used once and a modified Raspberry Pi 4 case which I've had 9 vent holes drilled into the lid to aid in cooling.
https://www.ebay.co.uk/itm/153585135502 ... 1555.l2649