Siebert claimed that in early November, "days" before Halbach's car was found in the Avery lot, he was sitting in his backyard and saw what he believes was a RAV4 driving down the quarry road, followed closely by a white Jeep. While he admitted to Klassen that he couldn't be 100 percent certain it was her car, he remembers this vehicle was the same blue-green color as Halbach's, and he hadn't seen many RAV4s at the time, so the vehicle stuck out to him.
...
Late one night, Siebert told Klassen, he saw two MCSD vehicles driving past the barricade and into the Avery property alone. He asked his daughter Victoria to call the local police to alert them to the fact that someone had crossed the barricades; she did, and was told there was nothing to worry about. (Victoria Siebert confirmed the call to Klassen, and a dispatcher discussing the call can be
heard on YouTube.)
Siebert told Klassen that a day after his daughter made that call, they heard on the news say that Halbach's car key had been found on the Avery property. According to police, the key was found on November 8th, so if Siebert's memory is accurate, he saw the cars drive past the barricade the night of the 7th. (Unfortunately, like so many pieces of evidence in the case, the calls to dispatch don't have dates or time stamps for corroboration.)