I had a quick look at the texts released by OpenAI, and it looked to me like a former Apple employee was sharing info and documents with a current Apple employee in an attempt to help out.

I do not know whether this lines up with the claims of stolen files.

The second part reads to me like they asked some company to perform a special metal finishing, knowing that they perform similar work for Apple.

I am no lawyer and I do not understand what is proprietary to Apple here, it just does not sound that big a deal to me.

Now that is a charitable reading. Maybe OpenAI ruthlessly stole Apple's trade secrets. I do not know.