Can Rebels trade mission tokens like keycards?

By progressions, in Star Wars: Imperial Assault

We played a campaign mission last night ("Spice Job") where the Imperials were hiding a keycard, which the Rebels needed in order to open the doors.

Once the Rebels have recovered the keycard, can they trade it or is it fixed with the hero who first took it?

Thanks!

The hero who retrieves the keycard keeps it in his or her hands until defeated:

"Retrieving Tokens", RRG, Page 22

Some missions allow figures to retrieve specific tokens. A figure adjacent to or in the same space as the token can perform an interact to retrieve the token. Place the token on the figure’s base to mark that the figure is now carrying that token. The token now moves with the figure.

• A carried token cannot be retrieved by other figures, traded to other figures, or voluntarily dropped.

• If a figure is defeated, any tokens that it is carrying are dropped in its space. This includes when a hero becomes wounded or if he withdraws.

• Mission rules specify the effect and purpose of retrieving tokens.

• At the end of a mission, all carried tokens are returned to the game box.

• Retrieving a token is not claiming a token.

Edited by Fizz

Thanks!