Can you compare the two by shaking it and see if you feel a difference.
A least you can pin the problem down.
Soooooo... Couple things.
First, I was being stupid. The PCV is NOT on the intake line from the AFE (duh, I wasn't thinking). It's on the PASSENGER side of the motor. It can still cause the blowback problem of course, but it's not physically where the oil/AFE is.
So, I went and got the new valve, pulled the old one (seems to rattle just fine, I don't think it's bad), and threw in the new one. I haven't had a chance to clean the oil yet, and I think it'll take some time to tell if I'm still getting blowback, but I don't think it was the PCV. It felt fine to me, but for $13, whatever, I'll leave the new one in and hang onto the old one.
I have 600 miles of factory warranty left and I'll be bringing this in under warranty soon.
I've attached the picture of the PCV packaging with numbers. Pretty simple to install. You'll need some sort of pliers and to be really tall, crawl into the engine compartment via the tire, or get a step stool.