I accidentally hit
c with a card selected and archived the card. I tried to undo the archive but couldn't find the option. I tried moving the card back to the list but that didn't seem to work.
In the right hand pane select
This will display a list of Archived Items.
You then click the
You can also visit your profile and see the audit trail of what you've done to each card, which includes a link to the archived card. Then you can "move" the card back to the board.