Old system 76 machine from a while back. Its what is running a majority of my services for self hosting. Only one screw keeps the case together, since I get into the insides quite often.

If you get bored and adventurous:

https://en.wikipedia.org/wiki/Computer_case_screws

Computer case screws are the hardware used to secure parts of a PC to the case. Although there are numerous manufacturers of computer cases, they have generally used three thread sizes.

The #6-32 UNC screws are often found on 3.5" hard disk drives and the case's body to secure the covers. The M3 threaded holes are often found on 5.25" optical disc drives, 3.5" floppy drives, and 2.5" drives. Motherboards and other circuit boards often use a #6-32 UNC standoff. #4-40 UNC thumb screws are often found on the ends of DVI, VGA, serial and parallel connectors.

You might be able to get a box of thumbscrews in the appropriate diameter and go toolless. I've had a number of computer cases that ship with those (my current desktop case just uses magnets, doesn't even have the thumbscrews). I have had a lot of less-than-ideal toolless things in the past, including poorly-designed toolless hard drive mounting stuff that wound up being a lot more work than the traditional tool-requiring stuff, but for the screws that keep the case closed, going toolless has always been a big win for me.