Sale 1: Sold together with about 5.5 keys for Eerie Orbiting Fire Brigade Helm (35; in-date) --> 29.5

http://backpack.tf/profiles/76561198138399630#!/compare/1493424000/1493510400

Sale 2: Sold together with 4 keys in items for Green Energy Janissary Ketche (26.5; in-date). --> 30

http://backpack.tf/profiles/76561198073472840#!/compare/1491436800/1491523200

http://www.tf2outpost.com/trade/28863594 - B/O was 30 (credits to Marty Birdman)

Sale 3 (credits to Marty Birdman) http://backpack.tf/profiles/76561198054945991#!/compare/1492905600/1492992000 - Sold for DBD Milkman + 7

http://webcache.googleusercontent.com/search?q=cache:http://www.tf2outpost.com/trade/28881871 - B/O was 30, capped there

Sale 4 (credits to Marty Birdman) http://backpack.tf/profiles/76561198060968956#!/compare/1493683200/1493769600 - Sold for PKS Aussie Minigun (~26)

Sale 5 (credits to Marty Birdman) http://backpack.tf/profiles/76561198264321170#!/compare/1489622400/1489708800 - Sold for 26 pure

Suggesting range from 26-30