Yep, super frustrating. This was at the Aloft hotel Hillsboro-Beaverton (1705 NE Amberglen Pkwy, Hillsboro, OR 97006).
It seems like it was the exception rather than the norm for this place, according to a couple of the employees. I asked a different front desk person if they recognized the two guests, maybe they came down to check out, but they did not. Employee said those two might have gotten a key card from the paying guest.