theres a tiny little rfid like radio tag type device inside the key fob which the car is looking for as a security measure, and if it fell out and wasn't put back in, the car security system wont see it and wont unlock.
The RFID has an encrypted code is what makes the remote unique.
I believe its the little black wedge in the picture:
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videos before and after (as well as rough 0-100 times from My gps data logger 
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