This took a while.

Ignoring all sales with banned people involved.

Sale 1:

https://backpack.tf/profiles/76561198252026134#!/compare/1497139200/1497225600

= Bulk

Sale 2:

https://backpack.tf/profiles/76561198184320338#!/compare/1497312000/1497398400

= Should be used on Vive

Sale 3:

https://backpack.tf/profiles/76561198184320338#!/compare/1497571200/1497657600

= Sold with Pink Bruiser’s Bandana(~0.5) for 40 keys pure.

Sale 4:

https://backpack.tf/profiles/76561198073821704#!/compare/1493683200/1493769600

= Should be used on Guardian

Sale 5:

https://backpack.tf/profiles/76561198073821704#!/compare/1494115200/1494720000

= 1:1 with Stormy Storm Dr Dapper’s Topper(39.5)

Sale 6:

https://backpack.tf/profiles/76561198121258526#!/compare/1495152000/1495238400

= 1:1 with Killstreak Australium Rocket Launcher(35)

Mini on Aussie RL: https://gyazo.com/73526e3b5c00b1d3c16e08189a8be645

Sale 7:

https://backpack.tf/profiles/76561198273579483#!/compare/1495584000/1495670400

= Bulk quicksell

Sale 8:

https://backpack.tf/profiles/76561198053558381#!/compare/1495929600/1496102400

= Bulk

Sale 9:

https://backpack.tf/profiles/76561198200149725#!/compare/1496102400/1496188800

= Low

Sales we have here: 35, 40, 40. The range 35-40 seems like the best one to use here.

More proof/counter proof/feedback/constructive criticism is always appreciated