Thanks for the detailed comments! I'd like to make a suggestion for keeping stale cards for a while (I like to have our boards clean too). What we usually do is that we create a release for them called "Trash" or for similar reasons another one called "Vauge ideas". Then we can just drop the cards there, keeping all their contents and we can restore them later if needed.

Stories may come and go when story mapping or iterating on a product. It would save time if you could retrieve a card previously deleted. Currently, I have to copy the user story content, mockups, and any other documentation to Word before deleting a card. Very time consuming.

Really need this for team that collaborate on the creation of story maps where a team member might delete another team members cards. The activity log tells you what happened, but based on volume, this can be a lot of work to recreate.