I think the only sure fire solution is keeping them from getting into the house in the first place, but that's hard to do especially if you have an old house. They can squeeze their way in through a 1/4" crack so it can be difficult to keep them out. Check again for any possible entry point, try getting a helper with a flashlight to shine on areas from the outside while looking for the light inside.
I think most suggested repellent measures are ineffective. Bounce dryer sheets, Irish Spring soap, mothballs, etc. may help in the very short term but as soon as the scent dies down the mice will chew on the soap and mothballs, and make nests with the dryer sheets. Some people suggest peppermint oil, but again it's probably something you have to reapply regularly to have any chance. There are sonic boxes that are supposed to put out a high frequency noise that only mice can hear but they have mixed reports too.
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