There is a saying in some places among the people, which means to break the wealth and eliminate disasters. For example, someone at home is sick or something. The old man likes to put three eggs in the bowl at the door, which means to wish you get better soon. There are also things that go wrong at home.
Four eggs and a blanket.
Putting it in front of someone else's house means touching someone else's luck but not for nothing. I wonder if there is this custom in the south. Don't worry too much, these are just folklore.