My problem is that I already bought that one

According to your picture,
the clasps would match.
They don't, blue case has 3, black case has 2!But the blue case doesn't seem to have that cutout (at least I can't see it)...
Plus, the blue case has "sharp" edges, the case I posted has more rounded ones.
**** me, I do not hope that mate tricked me ...
Is it possible that FMJ had 2 revisions of that case?