The mouse sneaks and triggers a mechanism that locks him in.
I caught Clyde last night and Bonnie this morning. Both were caught in the cupboard- I just stuck it on the counter for the photo. Then I realized there was only a few millimeters between my kitchen counter and whatever diseases he might be carrying. D'oh! Where'd I put the bleach?
Here's their holding tank. Bedding and snacks were included so they wouldn't notice they were in a plastic jar and could chew their way out.
I freed them in a vacant lot several blocks away. A third mouse*
When I returned from mouse deportation I heard chattering. I opened the back door. This squirrel stared me down a few feet away from the fence. I think he's their lawyer.
*A bunch of them probably either live under the foundation or in nearby overgrown shrubbery.