I can't help but think most of the circumstances surrounding DS's disappearance are really as simple as they appear. JMO, but here's what I now believe happened:
DS was seen on surveillance in the MetLife parking lot with a subject entering her vehicle (passenger side). Her parents alluding to her helpful nature indicates that the subject was more than likely known to her and she offered him a ride (could've been a total stranger, but IMO, DS is too worldly knowing potential risks).
She was instructed to drive, possibly directly to the Berkley residence. IMO, she did not drive back to IGA that Friday as the perp would've viewed that as a more populated area and didn't want to risk being seen. Surveillance may have shown the direction leaving the parking lot and LE most likely had additional surveillance on the route that picked up her vehicle leading to its whereabouts. Her parents question DS's demeanor while driving, wondering if it is known at this time that she has been taken against her will or if this was someone friendly to her and she became a victim later (at the hands of someone else).
DS's car was returned in the middle of the night. Perp knew where she lives and with many residents having "favorite" (though not necessarily assigned) spots, there were only a few options left as to where to park the vehicle. Perp may have even known where DS parked her car (depending on relationship), but most likely had assistance in dropping off her vehicle. Somewhere along the way, he ditches her keys. IIRC, the dumpsters at IGA were searched, but they could be found anywhere, which is why LE and family want people keeping an eye out for the distinct charm (possibly even prints on them).
IMO, the biggest question is
WHY DS? Something led LE to FG's residence. Not saying FG is responsible, but either her vehicle was seen there or someone who had connections to that residence gave enough probable cause for not 1 (but 2) searches. We know FG
isn't cooperating, and while there are other exceptions (other than consent) that would explain the criteria for the searches, none of them appear to fit this case, IMO. Vehicles and a mattress were taken from the residence and countless smaller items of which we do not know.
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http://www.aggressivecriminaldefense.com/searches.html