August 13, 2009 Patch
- The Engineer's Cap was added to the game.
September 30, 2010 Patch (Mann-Conomy Update)
- The Engineer's Cap was made paintable.
- [Undocumented] The Engineer's Cap can now be uncrated with Unusual quality.
October 6, 2010 Patch
- Paint affects the Engineer's Cap's color more, colors are less washed out.
February 14, 2013 Patch
- Updated the Engineer's Cap so the Red team version displays the correct color when paint is applied.
June 5, 2013 Patch
- [Undocumented] Revealed the rest of the NECA action figure promos.
July 7, 2016 Patch #1 (Meet Your Match Update)
- [Undocumented] Added Strange quality.