it's crazy how often incorrect myths are repeated with this case by those who are too lazy to look at the sources themselves. For instance, you will hear very often that the girls were "convinced" to leave their cell phones when going on a date with the last john before they disappeared. this is just an outright lie.
Another one is that they were found in burlap sacks...wrong. Only two of the 4 gilgo girls were found in burlap according to the original news reports. So other two were likely wrapped in garbage bags, like the dismembered remains along OP