FBI documents dealing with Duane and Jo can be found in FBI #51.
My favorite is found on p163. The FBI talked with the guy who bought Duane's van and found the wallet with the alias IDs in it. He drove to Jo's house to give her Duane's wallet. When he got there, he found Jo brandishing a pistol at some construction workers who were presumably being too loud nearby. He, understandably, didn't stay long. Quite the character, she.