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Unfortunately Sanborn maps are found at the Library of Congress, not the National Archives so you won't be able to tag them as part of our Citizen Archivist Missions. We currently have a mission for railroad maps that we're asking people to find the names of towns, streets, etc and tag those. You may find it interesting.
You are not limited to our missions to find records to tag and transcribe. Check out our how-to video -https://www.youtube.com/watch?v=6Kd7JwWJGFQ&feature=youtu.beSearching the National Archives Catalog to Find Records to Transcribe this will help you search for records outside of missions to work on.
Be sure to contact Library of Congress CROWD to ask them about the Sanborn Maps.
Community Manager, National Archives Catalog