I hate to say this, but you may have to kill them with mouse traps. Leave a couple snap traps on the edges of the room. Use peanut butter as bait. Rodents usually travel on the parameter of rooms out of safety. And they will be more active at night. I've caught a few wild mice in my roommate's room this way.
You could try glue traps, but that's not always effective.
Good luck!
Edit: Andrew beat me!
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