Some great sleuthing going on here, and the information about the hay is spot on. I also think since they used a hay fork the bales were big round bales, they are cheaper, and cows will eat any hay, even older discolored hay. Also, discolored hay doesn't mean it has had anything leaked onto it, it gets that way from being at the top, and sides of the hay stack.
I want to amend my theory on PF and SF's "great escape", I don't think anyone in LE tipped him off, they probably all knew with the FBI involved, etc , that he was being watched, they would not want their number showing up on his cell phone the morning of the arrest. Also, they did not even make it to the gate, which makes me think they were hustling to get out.
So this makes me think one of his farrier/roping buddies in the area saw them rolling down Teller 1 and called him. Which makes we wonder, Did they know what he had done? Where they involved some way? Why call him? The sub division La Montana Mesa, and Las Brises are just 3-4 minutes up the road from PF's gate. jmo