I would go with a live mouse. A small adult. That little one should take it no problem. Here is what I do with my stubborn feeders. Get a mouse from the store and have them throw a little mouse stinky bedding in with it. Set the box with the mouse in it on top of the bp's tub in the afternoon. With a few hours of prescenting he should get into feed mode with a quickness.
Is he hiding when your friend checks on him, or roaming the cage? Have you considered having a fecal test to rule out parasites?
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