Addendum: I am now the happy owner of the matching screws.
Flat countersunk head screw (M3x3mm, length 4mm / cross recess with 5mm diameter).
-> just type "InLine 77781A" into Google, and a dealer with A. will appear automatically. It's a pity that the matching screws can't be ordered from Digitec/Galaxus.

These SSDs are so light that for years I have simply placed the devices in the interior where there is no draught on them - it has never been a problem.

That's what I thought too. :) But the thread of the screws from the computer case is unfortunately too big for the SSD.

They are not supplied. Screws should be included with the computer case.