Ignition question

[Rharp]

Ok so I have a Ford SVT Raptor.
Thursday afternoon my wife had to use it to bring some parts to the platers for our company. After she dropped the parts off she tried to start the truck and the key would only go half way in the ignition. She went back inside and had the plater try, no luck. He then walked over to the body shop and had one of the guys there try, nope no luck.
I had the truck towed 30 miles to where I bought it and yesterday they called and said "someone had to have tried to steal your truck and broke something off inside, that's the only way the key would not go in". "we can't fix this under warranty, it will cost you 500 bucks.

This is total bs. No body messed with that truck. My shop parking lot is private, and my vehicles are in my view all day. My wife was away from it for maybe two minutes and when she came back it was still locked. I doubt a crook would lock it up after a failed attempt at stealing it. Plus no sign of breaking in anyway.

What is really tickin me off is the fact that they didn't tear it apart. They just assume if the key doesn't go in something has to be in there.
I told them I want it taken apart and prove to me there's something in it.

Here's my question
is it not possible for tumblers to break?
If they did could it stop the key from going in?
I'm gonna fight them on this but I don't know if it will get me any where.

Sorry about the rant.