Aluminum protective case? There's an aluminum protective case for the Tesla keyfob? I have the Tesla leather thing that you slide your key into.
I have an early 2021 Model X and I use the key fob inside a "Kwak's" aluminum key fob cover (available in four colors on Amazon*, eBay, etc.). This particular brand (there are others) seems particularly well made, with tiny screws that hold the two (top and bottom) "clamshell" pieces together around the fob, a screwdriver tool, insulation to protect the fob inside the metal case, and choice of leather lanyard types (all provided in a presentation box--makes a nice gift [hint: the Holidays are approaching]).
Some people complain that metal fob covers can interfere with the fob's wireless functioning. I have
not noticed that. If it does occur, I suspect it to be related to the status of the fob battery charge.
The aluminum case acts like an external "skeleton," protecting the fob at its edges while still allowing access to top, front, rear, and side (for Model X) control buttons. Whatever brand you choose, be sure to get an aluminum cover that is sized correctly for either the Models S/3/Y fobs, or for the slightly larger Model X fob (that has the side buttons for the FWDs).
Other fob "covers" that seem good to me include the Tesla silicon rubber band with key ring (still available on the Tesla "Shop" webpage), the original Tesla black leather holders with key ring (given out freely to early customers in the "old" days; nice grade of leather), and various fitted leather and silicon covers made in China. Coincidentally, here is a
little YouTube video that compares some of the Tesla fob cover options.
Tesla has obviously moved away from (expensive) key fobs (in favor of key cards and the phone App). Call me "old school," but I still prefer the (mini-me) fob (shaped, as it is, like a little Tesla car).
Disclosure: I have no financial ties and receive no benefits of any kind from anyone/anything involved with these products. I am just a satisfied customer.
_____
* E.g.,
here for Models S/3/Y and
here for Model X.