If he doesnt eat the mouse you can keep the mouse in a Plastic tote or small $7 critter cage or old 10 gallon tank. Dont try cardboard as they will chew threw. You can throw any food in there for them for a week. Dry dog/cat food if you have some or some scraps from your dinner. A little shallow bowl or something that holds some water. Make sure there are a couple air holes for the mouse too.
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