Sale 1:

https://backpack.tf/profiles/76561198089894338#!/compare/1530576000/1530748800

https://backpack.tf/profiles/76561198085116555#!/compare/1530662400/1530748800

Sold for C9 Bonnet

use there?

Sale 2:

https://backpack.tf/profiles/76561198085116555#!/compare/1531612800/1531699200

https://backpack.tf/profiles/76561198050930436#!/compare/1531612800/1531785600

Bulk?

Sale 3:

https://backpack.tf/profiles/76561198122604075#!/compare/1531699200/1531785600

Bulk/ use there

Sale 4:

https://backpack.tf/profiles/76561198074178367#!/compare/1527379200/1527465600

Untrace.

Sale 5:

https://backpack.tf/profiles/76561198337734785#!/compare/1527379200/1527465600

QS?

Sale 6:

https://backpack.tf/profiles/76561198337734785#!/compare/1527552000/1527638400

https://backpack.tf/profiles/76561198090078603#!/compare/1527552000/1527638400

Sold for KaW Warmer

Warmer Mini:

https://backpack.tf/profiles/76561198337734785#!/compare/1529625600/1529712000

https://backpack.tf/profiles/76561198172063670#!/compare/1529625600/1529712000

Sold for 22 keys (refined and extra key came from bot Strange cosmetic went to)

Lets take 22 keys.

Sale 7:

https://backpack.tf/profiles/76561198090078603#!/compare/1527638400/1527897600

https://backpack.tf/profiles/76561198084367252#!/compare/1527724800/1527897600

Sold for DP Kabuto

Kabuto Mini:

https://backpack.tf/profiles/76561198053747026#!/compare/1529712000/1529798400

https://backpack.tf/profiles/76561198087042029#!/compare/1529712000/1529798400

Sold for 16 keys

https://backpack.tf/profiles/76561198361191367#!/compare/1532390400/1532563200

https://backpack.tf/profiles/76561198316961222#!/compare/1532304000/1532390400

Sold for 13 Keys

Lets go 16 flat.

Sale 8:

https://backpack.tf/profiles/76561198084367252#!/compare/1527724800/1527897600

https://backpack.tf/profiles/76561198033370726#!/compare/1527724800/1527897600

Sold with 3 keys + ~2 keys in sweets for Cauldron Safe'N'Sound

Cauldron Mini:

https://marketplace.tf/items/178;5;u39

Sales for 49.99, 35.41, 20.05, 36.99 USD

Keys at 1.96, 1.93, 1.95, 1.95 USD

Totals are 25.5, 18.35, 10.28, 18.97 keys

Lets go with average of 18-19 keys.

Total is 14.5 keys

Sale 9:

https://backpack.tf/profiles/76561198033370726#!/compare/1527897600/1527984000

https://backpack.tf/profiles/76561198121345519#!/compare/1527897600/1527984000

Sold for 17 keys

Sale 10:

https://backpack.tf/profiles/76561198121345519#!/compare/1529020800/1529107200

https://backpack.tf/profiles/76561198337734785#!/compare/1531612800/1531699200

QS?

Sale 11:

https://backpack.tf/profiles/76561198337734785#!/compare/1530057600/1530144000

https://backpack.tf/profiles/76561198050930436#!/compare/1530057600/1530316800

Sold for 17 keys

Sale 12:

https://backpack.tf/profiles/76561198050930436#!/compare/1531267200/1531526400

Bulk.

Total sales @:

14.5, 17, 17, 22

https://i.imgur.com/1Wf2yKq.png

Sellers down to 19,

buyers up to ~15.

Taking 17 flat.