Agreed.
Add that to the long list of what we still do not know with 100 % certainty ?
We are here to sleuth and to help, and that in no way is to satiate our curiosity.... but to speculate and formulate theories on what we think may have happened and if possible to find out if there's something LE have not thought of yet.
I wouldn't be surprised if LE were reading
here 
; even though
they may know by now if Nancy returned home or not, and are keeping that close to the vest.
It's more than a week out and it feels like we're stuck at square one.
We have zero proof Nancy was seen after being dropped off by her Uber driver, so that person may have been the last person to see her alive, and that's troubling, imo.
The camera footage shared yesterday should have shown Nancy returning home in some form, whether walking up to her door or a car driving by to drop her off, but it does not ?
Jmvho.