I've been betrayed by my settlers!
I had 3 full suits of power-armour (which were all left with the power cores removed) parked in the Red Rocket workshop, where I've started a settlement.
I first noticed something was amiss when I went to fast-travel back to the RR and the power-armour icon wasn't on the map.
Got back there and there was a bit of a fight going on. Sorted it all out but a couple of my settlers got killed.
While I was looting their corpses (as you do) I noticed they had some pretty high-quality stuff.
And then, when I went to store that "new" stuff in my lock-up I found that ALL the good stuff was missing from my lock-up!
Went around trading with my remaining settlers and they ALL had various bits of my stuff - weapons, clothing and bits of power-armour.
I've got most of it back but none of the settlers are wearing a power-armour chassis and after scouting around the RR I can't find any sign of them.
I'm guessing that the RR was attacked and my settlers decided to arm themselves with all my stuff, including my unpowered power-armour suits and then got themselves obliterated.
Strange because the "common wisdom" is that you should always park power-armour with no power core in it to prevent somebody taking it for a joyride but it definitely looks like my settlers have been helping themselves to all my stuff, including my power-armour.
According to my stat's, my settlers have enough of everything and are 87% "happy" but I guess they're even happier when they're stealing my stuff.
Anybody know if it's possible to create any kind of secure-storage area?
I don't think it's possible to create a lockable door but perhaps it'd be possible to build some kind of lock-up and then use electrically powered stuff to protect it?