Avalon4ever, my deepest sympathy for the horrible anxiety you're going through! My heart goes out to you and your family.
I keep wondering whether Paul would be the type to ever pick up a hitchhiker, or stop for a motorist whose car appeared to be broken down.
I wonder too if he may have struck up a casual conversation and ended up telling the wrong person why he was in Montana, and that he was employed by the USPS. I fear that individual could have taken his car and used that information then to throw off the investigation.
Paul seems like the salt of the earth. He sounds so warm and friendly. I'm praying his kindness did not get him into trouble.
Many heartfelt prayers for him and your family!