Ah, you waited an hour, not over night. Put him in a plastic container with a lid or his viv if you aren't using loose bedding and leave it OVER NIGHT. If he eats, good! If not, throw the f/t mouse out. You can either toss him a live mouse or wait a few days for another f/t try.

With the next f/t, try braining and cutting the f/t mouse to make it ooze blood and bodily fluids; I don't have a BP yet, but with my two corn snakes, one will go nuts and one will not eat furry prey unless it is bloody. Again, leave the cut f/t mouse in over night with him if he doesn't eat right away.

You could also try scenting with a rat, broth, washing the mouse, and even tuna and see if that works.

Another thing; how do you thaw your mice? In room temp over a period of time, or quickly in hot water? Either way, try thawing in near boiling water to get the mouse HOT; this also gets a radical feeding responses from my corns.

I'm coming from corn snakes, like I said, but perhaps try these ideas? It sounds like your guy is a slow killer, and takes long enough to strike that this is a disaster waiting to happen, even if you are watching. Hope one of these helps/works.