Good points.

Dangling a prey item RIGHT IN THEIR FACE is a good way to ensure they won't take it that day - esp i the BP in question is in the slightest headshy. Mouse dance it some distance away from the snakes face - some BP's don't liek it when the dangled/dancing mouse is tail-up and thus appears much taller than they would otherwise expect and then bump-dragging it horizontally across the substrate might do it.

A Single mouse in a shopping bag should go down with a single whack against a sufficiently hard surface - don't be ginger in doing this - too many whacks you'll have a mess - too light and you'll just feel guilty at the twitching. Some of ours have to have the prey's nose held against a heat lamp a few seconds so that there's a real solid heat signature in order for them to take it. While there is a lot of room for individual idiosyncracies for each snake most of the methods mentioned will generally work - just be patient and try a few.