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"Kangaroo" pouch on the front seat holds/hides my charging network cards. There are a few cutouts in the carpet/lining above and behind the rear wheel arches in the trunk that might work for hiding things. One has high voltage wiring/junction so maybe not that one.
frunk but under the carpet piece above the 'microwave area'
it is a smallish piece of stiff carpet held on by velcro. could put cash under there!
if you have no center console or yacht floor, I think the little carpet strip in the middle can be pulled up too(not 100% sure if it is velcroed or just double stick taped)
actually I can come up with at least 10 of these spots...you'll never find my cash!