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Yep, where your feet are if you sit in the back seat. Just open the rear door and stick your head down there, you'll see them. Though you may need a flashlight.
Been there. If you dropped them down that air duct, take one of those telescoping magnet things, go under the front seat from the floor in the back and push it up the vent under there. It might take you 10 seconds.
I've been digging around in there for ages with a magnet tool. Is it all one big chamber? Haha I feel like an idiot.