Gabby Petito father goes on Dr. Phil
We don't know the exact day NS and JP started contacting Laundries.
However, we can deduce it wasn't into the second week in September.
"Petito said his family began worrying
after several days without hearing from their daughter."
Once they started worrying the next thing they would have done is start contacting Gabby and Brian.
Since there was no response they would have attempted to contact, text, pm, email--whatever it took to get a hold of Laundries in MOO.