I cannot see why people use both of their keys, I have two keys and never use one of them at all. It sits in a drawer with no batteries, it’s an original key with the Chrysler logo on it.
The one I use was in sad shape when I got the car so I replaced the case, which came apart in pieces as it had plenty of glue on it. Carefully done as per the instructions at the start of this threadI did no damage to the innards of it.
Why keep two keys in play when you can keep one as a spare for possible use later?