E3 2005 Nvidia LEGO Keychains

While cleaning out some boxes in storage recently, I came across two LEGO pieces that my wife got about a decade ago from a friend.  She had completely forgotten about them, and we knew nothing about them other than where they came from.

I have the male and female Nvidia LEGO keychains from E3 in 2005.  I tried to do some research on them to learn more them, but there was a surprisingly small amount of info on the internet.  All I learned was that they were a promotional give away at E3.  The only real article on them that I could find said that they were "extremely rare", and currently there is only one of them listed on eBay, and it's just for the male.

Anyways, can anytime tell me anything additional about them?  I was probably just going to throw them back into storage until I decided to look them up.  Are they worth anything?  Are they as rare as this one other person says they are?

Thanks!