Honestly, do you think that anyone will be kind enough to give you an unused code? Even if it was really unused, you're gonna use it and that makes the answer totally pointless because nobody can use it anymore.
The code card is P3PJCMXTXP
dragon
it is DRAGON
The code to unlock this clue is g5hj897z21
The hidden code on card 28 in the 39 Clues collection from the first book is "Salamander."
The code is:"password is dragon"
9999999999 Different person-----That guy is a jerk that's not even a code!
card 28-cern
Get card 28: CERN Puzzle answer: dragon ~James the Janus Check out this reusable card code! P3GJW7JEXP
dragon
Trustnoone & arrow4code
Password is dragon