Historical clue formulations

• Like scents and stencils — 2024-11-09
• Like some drawings and telephone numbers — 2015-07-18
• Followed back to its source, as a phone call — 2014-04-28
• Like stencils and missing persons — 2013-08-19
• Went over the line? — 2006-04-08
• Copied — 2001-05-20