Historical clue formulations

• Office square — 2026-02-01
• Note-to-self medium, perhaps — 2025-05-11
• Sticky note — 2024-08-13
• Kleenex : tissue :: ___ : sticky note — 2023-01-15
• Sticky note — 2020-12-15
• Stickie — 2019-08-19
• Something to be stuck on — 2018-05-17
• Brand of note? — 2017-09-17
• Tacky yellow thing — 2012-11-03
• Office attachment — 2011-07-22
• It's often put on paper — 2007-07-15
• Brief attachment to a report, maybe — 2007-05-12
• 3M trademark — 2007-03-29
• Stickie — 2006-09-07
• Tacky note — 1998-11-22
• Kind of note — 1996-04-25