Didn't Migrate StoryMaps on Time: Am I Screwed?

what it says on the tin; I got a panicked phone call last night that my org's flagship storymap is inaccessible due to the deprecation of StoryMaps classic. I can't even open it to reference it for rebuilding. I found some sample notebooks for making the migration but it's unclear to me that the item "exists" as an accessible json anymore. Did I completely drop the ball on this or will it be feasible to recover it?