Historical clue formulations

• Spare item? — 2018-06-02
• Spare item? — 2014-11-06
• X — 2013-08-08
• Trunk item — 2012-02-24
• Lever in a trunk — 2010-03-21
• Trunk item — 2008-09-13
• Flat remover — 2007-11-18