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I think you can be patient for a tad longer. When we moved in here I spied a mouse. I plugged the entrance holes to the flat (which I was aware of) and laid humane traps with peanut butter. Nothing for days. I renewed the peanut butter and put it back. One morning the trap had caught not one but two mice. That was it - no more since.
You know you only have one - so that's a bonus.
You'd hope it will get hungry and if you are not providing other sources of food (where's the cat fud at?) then the mouse will eventually find your bait.
I am actually very surprised it hasn't come out for a visit during the night yet and it's stayed in the same area the whole time... Not a single droppings in sight so I know it's not been out.
I am getting a bit concerned that it might chew through one of my pipes (washing machine or cookers etc)... other than that, I don't care it being there to be honest.