Higgledy
Knows what a fatty is.
Ummm... Have you opened the cryovac? That's probably two boneless butts in there.
I don't like cooking boneless butts, so I can't help on the question of tieing, but I would cook it at a minimum of 250, more like 270 until it is probe tender or the bone wiggles loose.
I have not opened it, but have read somewhere else that it is two butts. I really want a bone-in, but they had none. I am going to a real butcher next time.