You want my profile? They are very well-dressed, well-groomed, manicured, probably very highly educated sons of Doctors or Doctors themselves.
Or, being in Seattle, possibly software engineers.
If the FBI is interested, they're more likely Jihadist executives, not worker bees.
Very possible, or shoppers on an easy day trip from Vancouver, BC. If they were hanging out anywhere near Seattle, the photos are pretty good, they would likely have been spotted.
AQ watches TV, they are on ice somewhere.