I was able to get to one of the holes, I filled it with heavy duty paper towels (really compressed them in there), that seemed to have worked for now. I can't get to the hole that goes to the studs behind my side of the bed as it is too narrow right now, so I am going to catch them first, once I have them, seal the first hole they used to get in the house using sheetrock (the builder trimmed the sheetrock too short), then calk it etc, which will stop them from coming in. Then I will fill the holes in the attic going to our walls with a liquid concrete mix I have.
I left the motion sensors in the wall all year around, just in case (eventho I didn't think other mice would find the house as the house is in the middle of a big empty lot), and it spotted them a few weeks ago when we had our first snowfall. The house is only 2 years old, which is the frustrating part, but there isn't much you can do if the builder screws up.