Any puncture on your outside will be found on your inside. Cheaper to tear away the drywall, etc underneath the steps to find out what's going on than destroy perfectly good stairs.
If you really want to see what's under the stairs get a camera/line cam and record. You are pretty much going to see some hot air release where it shouldn't be. Hot air attracts rodents and creates a highway of access. As I say, this can totally be cleared up on the interior side of your home. Also, you can remediate the external by backfilling, substrates, rocks, etc in the places they were entering. This will shut them down quick.
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