There is only one problem: even though all enclosures of this kind looks exactly the same on the outside, on the inside all (that I have) are different (other two are from disassembled USB flash drives).
First one from the left is the one that I've ordered. Now, if you take a look at the latest PCB revision:
it obviously won't fit in there, since it was designed basing on the first enclosure form the right (blue one). Fortunately it's not a big deal. For now, I will just remove parts of the enclosure marked by red arrows, so as a result I will get something similar to the enclosure in the middle. Next PCB revision will obviously be redesigned to fit, without having to cut out anything.