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Funny I used to do all this stuff with my 1980 Honda Civic's metal spare key. Hung on wires in various places. Hard to do that with costly electronic keys. That wasn't to hide it per se, but in case I locked my original key in the car. Those were the days. I wish I were a diver back then so I could take my metal key into water. Now you need the spare with you because if you actually lose the chip key (not lock it inside), you can't drive the car at all.I have seen people use the trailer hitch receiver on their vehicle. When the hitch bar is not attached, there is usually a rubber or some other type of cover over the receiver. Pop cover off, put key in, and pop cover back on. Unless someone saw you put the key in the hitch receiver, they probably wouldn't look there.
I usually put my keys on the front bumper, behind the licence plate. Out of sight, and another place someone would probably not look. On my previous vehicle, a Chev Colorado, I could hang them on a spring, behind the tire, and well out of sight.
Divegoose
A couple years ago, I was completely lost after picking up a rental Audi at Berlin airport. I just wasn't able to start the friggin' car and was at a loss finding out how. And the user manual was in German, which I've had exactly one year of during high school. After some serious messing about, I found out that the key fob should be inserted into a hole in the dashboard which, frankly, wasn't PG-13 rated. Given the standards on this board, I won't say what it reminded me of. But it was a hole with some not-so-subtle rubber flaps around it. Into which I was supposed to insert the fob. And push it to start the engine.maybe I have one--our cars are 2016 & 2018