Well, you can put a hide in a feed box for him. I didn't have any trouble once I put the turf down. He seemed to prefer the familiarity of it to eat in a strange place. Of course all bp's have thier own wierd ways about them...........
Since you're using bark, that won't do. A hide will probably work. Set him in the box, he'll most likely dart for the hide. Then bring in the rodent. He should sniff it out. I usually let a rat run around in the feed box for a couple minutes to get the scent everywhere. Then when I lower Xaero in, he can smell food and is right away trying to track it down. After smacking the rat I put it back in the box. It doesn't last long.
Hope this helps. You shouldn't have too much trouble. The main reason they won't eat for you in a box is because it's a strange place where they don't feel safe. Make them feel more secure and they will focus on eating again. Then again, some feed in the tank and never have a problem. Give it a whirl, just don't get too stressed, we'd hate for you to stop eating, too! :lol: