I didn't call the pest people about the mouse yet, but I did let the in-house experts sweep the pantry regularly today while I checked that the sealed hole is not disturbed. They didn't think much of the place until our final sweep a few minutes ago, when they both went attentive and explored. Whitey wanted to go climbing again, so I actually grabbed a step ladder to help him get on the wired shelf (and then had to offer him a treat to use it, because placing the ladder scared him off.)
Now if I could only figure out Whitey's find of the evening, that an open Orville Redenbacher's box is half full of legumes. They sure didn't belong in there, and I didn't see a ruptured bag to cause it (but I didn't dig).
If I let him search tomorrow, maybe he'll locate our missing socks from the past ten years.