He could have driven his truck to Denver, left his phone there, took another vehicle back to the house ... left her watch and phone at home with the story, “oh she doesn’t always take them when she rides her bike” ...
This would probably mean an accomplice but maybe it was a vehicle that belonged to one of his employees? Like, “hey man can I borrow your truck to go to a club? My wife has a tracking device and if she sees my truck leave ... I’m in big trouble.”
I know that sounds a bit far-fetched ... I’m sure employee would relay that info to LE if that happened.
A rental car would be noticed, too.
Theoretically ... why couldn’t he have taken an old company truck that doesn’t have GPS and no one knows the last mileage count? Just speculating ... or just my opinions.