This axle stub is not painted at the factory. I asked Gary Flint about it at the 2008 meet (they are even rusty on the cut-away RL) and he said he didn't know why they were not spec'd to be painted, He thought the rust was of no significance.I don't see anything out of sorts there. Hard to know the history. Just because it came from TX doesn't mean it hasn't been driven in the snow belt.
Here's a pic of my rear diff area about 7 months after I bought mine off the lot, brand new.
But I don't believe I have any rust on the control arms like your pics show.
The control arms? I've had quite a bit and have repainted using black engine paint. I've thought of posting, but haven't had time. Maybe later.