I use sterilite lunch boxes with reptile carpet on the bottom and the exit hole on top for my bp's hides. These don't have any substrate in them and with the hole on top its easy to just drop prey right into their hides.
I had similar problems getting my female established and once I switched to these she felt safe enough to eat, she still won't touch it until I leave the room (feeding prekilled).
I'm just having a hell of a time switching from pk mice to ft small rats.