Unsold at 350 for 6 months: https://i.imgur.com/i2rROQ2.png

Sale 1:

160 pure (qs?)

https://backpack.tf/profiles/76561198165802400#!/compare/1536624000/1536710400

https://backpack.tf/profiles/76561198148511293#!/compare/1536624000/1536710400

Sale 2:

223.5

Burning Woolen Warmer(202.5) + Smoking Titanium Pillar of Hats(15) + 3 keys + about 3 keys sweets

https://backpack.tf/profiles/76561198165802400#!/compare/1534723200/1534809600

https://backpack.tf/profiles/76561198418740133#!/compare/1534723200/1534809600

No in date useable sales of the pillar, hopefully this is ok:

https://marketplace.tf/items/30008;5;u35;strange

$30 / $1.95 = 15.38 keys

Sale 3:

Bulk

https://backpack.tf/profiles/76561198418740133#!/compare/1533772800/1533859200

mini is a bit wibbly wobbly so rounding to 225

Sale 4:

$350.89 / $1.87 = 187.64 keys

https://marketplace.tf/items/616;5;u17

https://backpack.tf/item/6767913302

Sold in 3 days, calling that a QS

Sale 5:

Sold for 392.5 in in-date hats and keys

https://backpack.tf/profiles/76561198054758757#!/compare/1536969600/1537056000

6 month unsold at 350 means this is excluded

Sale 6

299 rounding to 300

Sold for Haunted Ghosts Crone's Dome(255) + Stormy Storm Master's Yellow Belt(25) + max head(~19)

https://backpack.tf/profiles/76561198037921690#!/compare/1537747200/1537920000