I don't know really, just a feeling I got. I think it's kinda sloppy how we don't know about the money and what happened between Boyd and Augustine in the car after they found out the cops got there first, we just see Boyd alive and kicking with Ava later that day. Given that Augustine has been shown as no nonsense kinda guy one would think he'd just say "I've had enough of your failures" and shot Boyd. It's not like he needs Boyd for getting Raylan and his ex-wife, that info is one google search away or at worst; one small bribe