BF, what kind of electronics do you work with? I've worked on a lot of electronics, computers, etc. and have never run across Posidriv screws. Is this specialized electronics or British electronics that you work with? (I'm in the US.)
If I've run across them, I may have mangled them and never knew.
Just curious.
The latest was on the back of a conference camera/speaker bar, though I don't think they were PZ0 since they were part of the bracket for the stand, and it's a heavy unit. Must have been PZ1 because PZ2 didn't fit. Honestly I thought it was an odd choice, given the location and purpose.
The other items were some random junk that may have come from England or something. Sometimes I will disassemble old/broken stuff to save the screws. Why I do this, I do not know, but I have a nice collection of screws.
Edit: More I think about it, I swear I've seen them in laptops. Can't remember the brand or model though. I remember seeing the PoziDriv markings, and not knowing at the time WTH it meant, except that none of my Phillips screwdrivers would fit properly. LOL.
I have also seen a lot of PZ2 screws on things like hinges, etc, and they are nearly all stripped, because whoever put the screws in used a drill/driver and a Phillips bit.