I normally offload metallic objects, jackets ad nauseum into the trays.
However at YVR the detector is ultra sensitive and security surprised me by asking me to put my passport and wallet into
yet another tray, Once through I retrieved my trays, except guess which one.
Some half hour later when about to buy a coffee, I discovered passport and wallet missing and returned to security. It took a few tries to find a helpful security person who directed me to the office where they were holding my passport and wallet. Happily they were not scooped by the wrong people.
Note that there was no announcement asking me to report back to security
Note to self: put passport and wallet in preferably zippered jacket or backpack.