What is the screw type, size, and length of the four screws that hold the case together? I find they are too short! I barely got one thread turn in gauged on three screws and could not get the 4th screwed in at all! I am using the four longest screw, not the 2 shorter ones for the case top. Also, it would be nice if the PCIE flat flex cable could be a little longer. I had a difficult time getting it in the NVME carrier board.
Same here, I’ve raised a support request so they can send me longer screw types, my pi is just rocking around in the box because of that, and when i insert a usb drive, it turns off the system 
Just want to reiterate this issue.
Bought two Neo NVMe cases and the screws are indeed too short. Luckily my box of spares had some M2.5 x 8 screws in which work perfectly. Supplied are M2.5 x 6 and are inadequate.
I found on my NEO the four flat-head screws were for the M.2 heat sink and the four round-head screws were for the case bottom. Make sure you haven’t gotten them reversed.
They are not reversed on my NEO. The round head screws are too short.
I have a similar issue - I cannot get thw two screws on the hdmi and usb-c side to secure. They keep on falling out. The other side secured, but I don’t know by how much.
All 4 screws are the same length.
Screws are definitely too short on one side. It seems slightly longer screws should work as the current ones just about touch the thread. Would only replace them in the side where you can see the top screw hole.
I tried contacting the customer care, but they were extremely unresponsive and did not care to understand the problem. They simply sent me a new set of screws (same size), and thermal pads. not really helpful.
I hope @joseph.zapanta reads this, but you are bundling screws that are too short, resulting in frustrated customers.
Just for reference my support cases were 12831, and 12553, you can find out who handled the cases through that.
@SinisterOrange probably the M2.5 x 8 is just enough but we might be better off with a M2.5 x 10 good.
Just received this case purchsed on PiHut and have the same problem. I used the 2 spare shorter (flat headed) screws to secure the RPi to the middle layer of the case directly (not through the holes on the bottom of the case) which is fine as a workaround for now, but obviously means the bottom of the case is only secured on one side. Have contacted PiHut and Argon with support requests but based on what i’m reading here (and the age of this thread and lack of reply from Argon) i’m not going to hold my breath. Going to try and source some M2.5 x 8 or M2.5 x 10 screws as suggested…