Re: replacement keys
they are just telling you what a dealer would say. the usual advice is that a second hand key wont work no matter who you ask.
i fitted a newly cut blank to a second hand key and managed to get my local alfa dealer to get it wokring with my car so i know that it does work, but it took a few attempts before the dealer agreed to do it. in the end i said that my key was working fine one day then not working the next. that was the only way i could even get them to look at it.
if i mentioned anything about buying a second hand key they would immediately refuse to have anything to do with it. my car uses fiat code system2, you can tell what yours is by the number on the metal part of the key. i dont know if system3 will work with second hand keys, but i know system2 does.
logically there is no difference between a new and a second hand key, both are precoded during manufacture, both the immob chip and remote rolling code set. the programming procedure does not alter the key in any way, the car learns keys, not the other way round.