In general, its unreasonable to believe that any event, prior to Butch Atwood's arrival, is directly connected to Maura Murray's disappearance. Because to assume that the connection exists, you have to assume the unlikely:
Whoever she previously interacted with was able to avoid being noticed by Butch Atwood.
Note: The presumption Maura Murray was abducted (by a stranger) requires we assume that she was the Saturn's driver.
It she was a passenger, one would presume that the Saturn's driver would have notified the authorities that she was abducted.
On the other hand, if there was a driver and she was the passenger, the Saturn's driver has not come forward.