Don't just look, feel in them.
I've several times paniced about losing my purse, and it was in the bag where I was looking for it all the time - a black purse in the bottom of a black-lined bag is hard to see.
Not quite the same for burgundy passports, but feel pockets where it might have gone, or slipped through the lining.
If it's in your underwear drawer, could it somehow have been pushed over the back of the drawer and is now lingering in the bottom of the chest, hidden by all the other closed drawers?