I saw a mouse crawl under the front porch today too. Our neighbors moved out a month ago, and it appears our pest control left with them (their cat, Eva the Diva).
It looks like the black mold was contained to a small strip of it where we initially punched thru. Today I ripped apart all the drywall around that space (thereby exposing it all to light) and found the rest of the mold is white and yellow. Yay!
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It has been destroyed with bleach water.