..on Sanctuary Hills.

I was wandering around, clearing some areas, getting some loot, wanted to head back to Sanctuary Hills, where I store my stuff and build some huts, crops and fortifications.

So, I fast travelled and hear some shots. A settler with pulled out gun run across me, screaming something...I was like "What the?! cO" and was following him towards the gunfire.

At the gates, my turrets went crazy, my gaurds as well and I saw a huge pile of Super Mutant Corpse in front of my gate.

Was laughing like hell but than it happened:

SOMEONE TOOK MY POWER ARMOR!!!

I forgot to take out the fusion core so some settler thought it might be ok to borrow it...Would be ok, if there was not the following: The [censored] took all the armor parts! My PA is completely stripped! Aaaaaaaaand....i can't trade with the settlers anymore! When I'm talking to them, they're just like "Yeah thanks for the help master! I took your PA, hope you don't mind I sold the armor plates to get some jet dude, totally high right now!"

I want my friggin Type E, lead platet PA back!

Moral of the story: Never leave a fusion core in your PA, those greedy bungholes called your slaves..erm..settlers will steal it if you just go take a dump...

It is possible to pickpocket the fusion core if you find the guy wearing it, save before attempting to "swipe the fusion core though.
When successful, whoever is wearing it will be forced to exit it.