Not sure what happened, but as soon as I posted the story about the kittens in the garage, that same day they were gone!
Offdachain thinks that Mr. SPCA probably came back to rescue the kittens. I am just glad that the whole situation prompted Offdachain to clean out the garage. We also keep the garage door closed at night now too.
I saw the mother, Sylvia, the other day in our driveway. She stared me down, looking at me like maybe I took her kittens away. I refused to let her scare me, so I walked to the trash can and she ran into the woods.
I walked in the house, closed the door, thanked God that he made me a human mother and loved on my little litter.