Do you have your car back? Is it OK? Last we heard it was at the Service Center with very low battery...
A Faraday pouch would help for your key... A PIN would help. Although some had trouble in the early
days of the software with PINs.
I have had 3 fobs made for my car on 2 different mobile service visits.
They are very hard to program even with the correct Tesla tools.
They have very complicated computer keys...
I do not think you have to be concerned.