And his laptop was last accessed on Tues the 20th in Beaverton, OR. Is that accurate?
We know he came back to Seattle because of the cell phone ping downtown, so it would seem that he was not on a one-way trip out of Seattle. IMO, it is really unusual for someone to drive that far distance or take a train to Beaverton. I've lived in Seattle since 2001 (minus a 2.5 year hiatus) and I've never, not even once heard someone say they went to Beaverton for any reason. People do go back and forth to Portland for biz or to visit for the weekend, but FYI for those not familiar with the Northwest, Beaverton is not AT ALL a common destination for Seattleites. I think the key to why J is missing lies in his trip to Beaverton. I'm shocked that his family is not trying to get more public information about that.
link to transportation times/duration for car and train from SEA to Beaverton.
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=seattle%20to%20beaverton%20train
ETA: I deleted "afternoon" computer access in Beaverton as I realized no time was given.